I broke up with my ex boyfriend on a mutual basis a month ago, two weeks ago he was sending me messages saying he missed me and he was going crazy. But the other night I went out with some of our mutual friends and he showed up and sat next to this girl who is friends with my friends but I don't know her that well. When I was still with my boyfriend he told me several times that he thought this girl was hot. Anyway so they were sat right in front of me and he was flirting with her all night, touching her arm, throwing party poppers on her head and patting her hair, drinking shots with her. It made me so upset and so angry and I havn't been able to stop obsessing over it ever since. I ended up getting really drunk and staying up all night drinking to drown my sorrows. I think she is seeing one of our other friends aswell so he is behaving like an idiot.
How can I stop myself obsessing over him all the time, it is driving me crazy. I don't have a job or any motivation to get one and I can't stop thinking about him all day and how horrible he was to me when we were together and how hes got loads of new friends now and is becoming a successful dj and he doesn't deserve any of it. I even dream about him! I just want to move on but I don't know how and I don't want to have to stop going out to avoid him.