Single mommas do it best ;). Keep your head up momma! Stay strong!
Eventually once that baby comes he will come around. If he's man enough to make a child and take care of his other kids than he should be man enough to take care of your baby.
Just do what's best for you and your baby. Focus on you guys. Screw him. There are plenty of men who will love you and your baby and not cheat. Just show him and his family that you don't need him. I know it's hard but you need to put your foot down
Dump him you do better doing it on your own