Girlfriend of 5 years and I broke up about 4/5 months ago. Found out she fucked my best friend and one of his friends senior year in a threesome. We have talked and hung out a few times. I just think about it way too much and her too much. I really just want to move on mentally. I have been with 4 girls since but this just won’t leave my mind. She was my best friend since 14 and we did everything together I guess a part of me still misses that. I almost feel angry at her sometimes for ruining things. I don’t know any advice would be appreciated.

TLDR ==> Girlfriend of 5 years and I broke up a few months back. Need help getting this out of my head/advice for dealing with the thoughts