I have an answer, but I don't know if you'll be able to apply it.
Feelings are a powerful force. They happen. But when we say, "He made me feel..." or "she made me feel..." we are not being accurate.
Nobody can "make me feel." Whatever they do, my feelings are subject to me. And even when they threaten to overwhelm me, I'm still choosing how to respond to them.
In short - I'm in command. I'm responsible, no matter how I feel, no matter how I chose to respond to what someone said or did.
This is true for both you and the father of your child.
If both of you can "get" this point, and integrate it into your lives, you have a chance at a happy relationship, and a long-lasting one.
I pray you will both get it, and choose to love each other and your baby, and create a wonderful life together.