It took me 11 years of marriage to an abusive, alcoholic man to get away from him. I had three children and I was scared to death because I had become isolated, unemployed, etc. He was good with them, or at least kind and gentle with them, but absolutely awful to me.
I thought I should sacrifice myself to give my kids 'a family'. Being married also allowed me to stay home with them. But I was dying inside. I was so unhappy and no amount of counseling, self-help books, giving, could turn it around.
Something happened at the very end when my then-husband left on a business trip for a week. I was so happy and free during that week when he was gone. I then realized, big AHA moment, that I needed to get divorced. I needed to save myself, or there would be nothing left of the mother my kids needed me to be.
I don't know what your situation is. Some other people here have touched on different problems that arise in marriage.
The biggest thing is the guilt so many mothers feel. We grow up thinking good mothers sacrifice and give - pouring yourself out to everyone around you. When I became a mom, I became lost to myself. For the first time all I could see was this baby, then toddler, then preschooler who was totally reliant on me. I forgot to look in the mirror and even comb my hair sometimes during those first years.
You love your children, of that there is no doubt. Now it's time to love yourself. Really stop whatever you are doing right now and LOVE yourself. Tell yourself kind things.
Then talk to your husband. Tell him how you feel. Tell him you are contemplating divorce. There is a way to do this and stay strong, keep your boundaries, trust your instincts, follow your heart, choose your words carefully. Tell him your feelings in "I feel" messages and totally leave him out of it. "Dave (or whatever his name is), I have been feeling empty and alone in this marriage for while now. I have been feeling lately like I want to get divorced. What do you think?" And leave it at that. Let him respond. You may already think you know what he'll say. You may be afraid.
BE BRAVE. This is exciting new territory you are heading into. Change is always scary, but staying where you are will just bring you more of the same.
I have an awesome resource for you now. Don't buy anything from this link, just read through the free stuff. I did buy her workbook and it's amazing.
http://www.coachrori.com/
Don't try to control his response to you. Let him be responsible for his own feelings. You can't MAKE him think or feel anything, so don't believe you are responsible for him that way, even if he tries to tell you that.
There are no "rules" about marriage, you know. We go into it thinking that there are, but each couple makes it up as they go along. Counseling can sometimes make you feel worse, believe it or not. Counselors are just people too with their own experiences. There are a lot of ways you can work on yourself to be strong inside that don't need to have anything to do with your husband. Mentally unstrap yourself from him. That doesn't mean stop loving or giving up on the marriage, just don't give him the power over your emotions.
Good luck, A.. I am sending you good energy.