<human>: After four years of dating, I decided to get engaged to a woman who was my best friend and she said yes. 

Unfortunately, she changed overnight, abusing me mentally, physically, emotionally, and cheated on me more times than I can count. She used me for a hand to hold and partied with other men while I did her homework, that kind of thing.

I kept trying to make it work, but she dumped me for a friend, who she had told me was gay, and now she's engaged again.

Meanwhile, its a year later and I still can't have a successful relationship, and I can't find anyone that I want to give my heart to like that. I don't want her back, and I honestly don't miss a single thing about her, she was awful to me.

It just really hurts, and I was wondering what reddit thought. Is she right to move on, or is this just another crazy thing for her to feel alive, like she used to do? Or am I a pussy for not being able to move on?

Any thoughts are welcome, I'm not doing too well. Thanks for reading.

Give me the gist of the text in a nutshell
<bot>: Ex-fiancee abuses, cheats, dumps, almost immediately gets engaged again, and I'm still alone. Advice?