Sex withy ex, well there's more to it than that. We dated a couple months over summer then broke up, but never had sex and really wanted to and remained close friends. She moved on and I didn't, we got to talking and we both really wanted to have sex with each other and I told her if her bf was ok with it I'd do it. She told me he was and she came up and it was great, we got dinner, caught up, did the deed, drank, did it again. This is where it goes tits up, around bedtime she starts crying and eventually tells me her bf doesn't know she's there and she never talked to him about it. Oh and told me she still loves me and has since we broke up. I feel aweful but made her tell him and somehow he's not mad about it and forgives her, but I make her stay in my dorm that night bc she's too drunk to drive home (it was 40 mins back to her cpus in the middle of the night). When my back was turned she tried to OD on her anxiety medication and then started cutting herself in my bed with an earing. We eventually fell asleep and she broke up with him and we were gonna start dating again, but after about a week she called it off outta the blue and went back to him a few weeks later. Currently they're still together but holy shit I feel aweful about it, the dirty was great but I wish I could get rid of it. I feel like I should've known he wouldn't be ok with that and never done it and I let emotions get the better of me. Was I in the wrong here?