How do you get over a relationship when there was so many promises? We were together for 4 years…

How do you get over a relationship when there was so many promises? We were together for 4 years before I had Emma. He broke up with me when Emma was two weeks old because I didn't make him "Happy" anymore. (I had postpartum depression) and he doesn't believe in depression. She's now 7 months old and comes over and sees her twice a week and he's a great father but it's so hard and on the rare occasion he takes her for the day he has his mom watch her there whole day. He won't talk to me about anything. He says I confuse things. It sucks when people can't keep their promises!!!