You do what will make you happy but don't make that happiness dependent on a man. Only you can make yourself happy. And I cannot emphasize enough, you do not move because there is the possibility that this man will continue to provide you with "laughs and good conversation." I have had several relationships with men who have commitment issues. None of them have remained in my life. They have married and all of them have divorced again.
I met a man with whom I spent a great deal of time with while I was on vacation visiting a mutual friend. We wrote letters and talked on the phone every once in awhile. A few months later I decided to take a leave of absence and drive across the United States. I lived in Oregon. He lived in Maryland. I had wanted to do this for years. I told myself that I was doing this so that I could see the country and spend more time in the historic East. I'd traveled there often and loved it. I saw having him as a friend as a plus. When I got there I found that he had a girl friend about whom he had not told me. And that he couldn't see me at all. Our mutual friend said that my driving East to spend a year frightened him. I was devastated. I realized that he was a more important part of my decision that I'd realized.
I made the best of it and did eventually have a good time during the last 2 months that I was there. I did make a few friends but none of them were as good of friends as I had in Oregon. I loved being there. I had a difficult time deciding to return. What decided it for me was I had a very good paying job waiting for me in Oregon. I had only been able to find a minimum wage job in Maryland, even tho I had a BS. I returned to Oregon and am glad that I did.
I could take this risk because I was only responsible for myself. I was somewhat emotionally volatile for 2-3 months. I would not have been a good mother. I wasn't a particularly good friend either. I was depressed much of the time I was there.
Several years fter I returned I adopted a special needs 7 yo girl. I could not have raised her without my family and friends in Oregon.
Your friend may overcome his commitment issues with time. Of concern to me would be is he doing anything to deal with them. Ideally I would hope for counseling. If not counseling, is he aware that he has issues and is he thinking about them and working to change them? How long has he been divorced? Does he have children? Many things affect both his ability to make a commitment to you and whether or not your commitment to him is the best thing for you and your daughter.
Then, there is the possibility that you moving to his town/city will feel threatening to him. Have you talked in specific terms about this with him? What is his reaction? Looking back on my conversations with my east coast friend I did remember him saying, don't come back here just to see me. I wasn't going back just to see him and so I didn't pay much attention to that. I didn't expect an exclusive relationship and I told him that. His comment should have clued me in to the possibility of rejection once I got there.
I don't see your decision as one that will either make you happy or your family happy. You can be happy in either place. I see your decision as being more complicated than who to make happy. Your decision is about what will make you happy AND be the best for you and your daughter.
You have your daughter and her well being to consider. Will she receive good care; not OK or satisfactory care but care as good as she gets in St. Louis with your extended family? Will she feel secure? At 4 she has begun to adventure out away from you. She now has friends and family that she emotionally depends upon. They won't be available when they're 10 hours away. She will grieve that loss. And she won't understand why she has to move. She will depend more on you in the new place than she does now.
Moving will be a major change for both you and your daughter. It sounds like you did have some difficulty when you moved back to St. Louis. You felt that you were doing it for your family's happiness. That is part of the difficulty but you also had to adjust to a different way of living and doing things. It may be easier to discount that adjustment as being a part of making your family happy. Reality is that it's a major adjustment no matter why you make the move.
Will you have the time, energy and resources that you had as a college student when you moved away from St. Louis the first time? It is much more difficult to find community which includes friends with similar goals and life styles as well as the motivation and time to build friendships when you're not in school. You are now a mother and most mothers who work have little time to socialize. You were single and in school when you established yourself before.
You cannot depend on your friend to provide the type of support you have with your family in St. Louis or had when your daughter was born. Also, you said you've been dating off and on. What has changed so that it won't continue to be off and on. Did he include you in a discussion of his plans. Did he say that he would very much miss you and wished you lived closer? If not, this is a shaky relationship at best.
How do you know you will be able to find a job? Do you have specialized training in a field with not enough trained people? Jobs are much more difficult to find now than they were 2-3 years ago. And you found your current job with the help of your family.
I suggest that you spend some time thinking and writing about what would make you happy. It sounds like you'll be happy with this move because this guy with whom you've had a good time will be there. That is a very small part of your life. The description you give of your life in St. Louis is that of a good life that has taken some time to build. You say you want warmer weather. I don't think any place 10 hours from St. Louis would have noticeably warmer weather. You want a partner. Following this friend actually gets you no closer to a partner. He has commitment issues. Please accept that he may not resolve those issues and consider the strong possibility that your moving there will cause him to pull away. He also has the stress of a new place and a new job. Even if your presence doesn't add to his stress, the stress will change his relationship with you. I would put more trust, tho not a whole lot more, in the premise that absence makes the heart grow fonder.
Why did your friend move? Does your friend have a job in this new place? What is his work history? Is he able to support a family financially and emotionally? Are these the questions your parents are concerned about? When we are young we don't like to think that our parents might know better than us but it is important to listen and consider their comments because they have had much more experience than we have. They are not always right or even mostly right but they do add wisdom to the discussion. We help ourselves when we seriously consider their thoughts.
I think that moving is much too big of a gamble. You can lose everything that you have now. Make a list of known positive reasons to move and a list of possible negative reasons. If you find a job before you move you can put that on the positive side. If you visit your friend and know with a fair amount of certainty that he would welcome the move that can go on the positive side. If you also spend time in the new location and find activities and groups that spark your interest there is another plus. Just do not impulsively move! Research and check out plans before deciding.
When we're single and don't own a home we are able to take more chances. Once we become responsible for a little one we have to consider the affect of everything we do on that child. She can adjust to the move. The main risk, that I can see, is what happens if it doesn't make you happy, as you expect? How will that affect your ability to provide a stable and secure environment for her?
At the same time I think that it is important to take risks. I am glad that I gambled and lost a part of my dream when I traveled East. What is important is that we are as totally aware of all facets of that risk when we make our decision. What can we lose? Are we willing to lose it? Or will the cost be too high?