<human>: Condense the text into a few key points

5½ years ago I became best friends with.
Roughly 5 years ago I asked her out and we were a couple for two years, before we moved in together. Then after almost 2½ years of living together and 4 ½ years of dating she got drunk, and made out with her ex.

We broke up and moved out separately. After a few months we started talking again, and we became good friends again, even friends with benefits. This lasted for about 3 months (up until last week), and I kinda developed a feeling of wanting to be with her again as more than friends.
However, we were talking one evening when she said she couldn't continue being friends with benefits, and we talked about that for a while, and eventually it came up that she had met this new guy (over Tinder) who is just everything I wasn't back in our relationship, and he was just sooooo amazing.

How do I move on after that? What can I do?
She has been my best friend for a long time, but I'm not sure I can be friends with her, or that I can stand to look at her with another guy.

But I would like to try to be her friend, and I would like to accept that she's moved on, I just have no clue as to how.
<bot>: Gf and I  broke up, we became friends with benefits, got feelings for her, suddenly shes seeing some guy.