how do you get over an abusive exp

It was an 'abusive' relationship, he was so controlling and manipulative he lied and cheated on me a lot, I was trapped, I was so unhappy. I didn't love him and I'm glad it's over But he's managed to make me feel like I'm not good enough for someone to be with. The girl he's with now is disgusting like she's a vile person. Who he's openly talked trash about to me and told me he ended it. He lied and I found out they're together. it's just upsetting that I'm not better than that and that he'd chose her. I find it hard to trust anyone now. I'm scared to be with anyone incase they do the same and leave me. I just can't get over the feeling of being unwanted and not being good enough like I'm unwanted.