I think you know the truth, but admitting it to yourself is a whole other thing. It is easier to deny it to ourselves because then action does not need to occur, then we can still onto our hopes and dreams of being a family, and it just plain hurts to know that our loved one is not who we thought they were, not who be emotionally, physically, financially, spiritually the kind of partner and father you or your child needs.
I am so sorry you are hurting like this, we have been there- we all know how hard it is to accept and then do something about it. Your daughter is number one priority and you have to remember that YOU needs matter. YOU deserve to have someone that treats you right, someone that is capable of being there for you, and someone that doesn't rip your heart out and then turn it back on you. You cannot control or change him- all you can do is work on yourself and take care of you and your child.