I doubt there is a way to repair trust with him at this time nor should you want to. He may be the baby daddy, but he has two females that will eat his crap. Leave him alone and get your child support, and build a healthy life for you and your child without him.
How many times are you supposed to say I wont do it again and think you will be believed? Come on, work on yourself so you can do better for yourself, and your child.