Has anyone else gone through a relationship like this?

So I just feel like if I talk about this, and hear other experiences, it will make me feel better. I had a boyfriend for a while that I really liked. I thought I even loved him. Throughout most of the relationship, he was a decent boyfriend and decent person and general, but he never really treated me special. After a while, he just suddenly stopped having any feelings for me. He didn't treat me horribly after that, but he was a complete jerk at times. He picked fights with me and avoided me when he could. When we were around our group of friends he would talk to everyone but me. After a few months of this, he finally admitted that he was unhappy and broke up with me. Now he has a new (well she's actually been with him for quite a while now) girlfriend that he treats like a queen. She's the most amazing thing to him. I know this girl really well, and I can't for the life of me understand why she is so much more special than I was. I don't think I'm better than her or that she is horrible but I don't see why she is better than me (or at least perceived to be). She even cheated on him a while ago. He was upset with her for not even an entire day. He said he couldn't stand being without her so he took her back and completely forgave her. When he was with me, he said that he would hated cheaters because he had gone through it before. And another thing, every single one of her boyfriends have been the same way. They all worship her. I'm just feeling bad about myself, jealous of her, and angry with him. I know I shouldn't feel this way. I try not to but I can't seem to help it.