Im 33, w a 2yr old...was married to my sons dad for 2yrs, together for 4yrs. The fact that you stayed in a marriage just because of your kids says a lot to me. You obviously were only there for them, not for the relationship with their father. So its natural to feel the way you do. If your husband does not make you happy, complete you, support you, make you feel loved, cared for, cherished, respected, and IMPORTANTLY, isn't your best friend...then 20yrs is a long time and time to move on.
My ex calls me a quiter and a failer for walking out on our marriage. The thought of having sex with my husband made me sick to my stomach. The touch, did NOTHING for me. I wasn't in love with him anymore. He wasn't my friend. And knew my heart was gone and I tried counseling myself. Ya it helped our communication but it didn't help rekindle anything of how i felt towards him. Oddly enough, having my son made me realize I really did not want to be with this man anymore. A month after our 2yr annv., i walked and never looked back. That was 2yrs ago.
Do i regret it, NO! I am LOVING every minute I am not with him. Unfortunately he is still in my life due to our son. Hearing his voice is a constant reminder why i left. No matter how hard this man tries to get me back and say what he says, I made the right choice. Yes my son doesn't have a full time father, but i REFUSE to stay in a unhealthy marriage for my child.
If you feel in your heart your done...your done.