I'm obsessed with my best friend's gf who cheated with me
Why are you obsessed with your best friend's girlfriend?
I heard she was a pain in the ass and had lots of issues, so I secretly had sex with her.
You shouldn't sleep with your friend's partner. It's not healthy to develop an attachment to someone you cheated with, so you should get over it. It's only going to hurt your relationship with your friend when they find out.
I don't care. I don't think my best friend deserves her anyways.
How would you feel if your friend was having sex with your girlfriend? Don't you think you should find other people to date and leave your friend's girlfriends alone?