I met him about a month ago at work, liked him from the start but found out he had a girlfriend and tried to keep a reasonable distance. He was always really lovely and quite flirty with me but it always felt pretty harmless.
anyway... we went out after work last night, we stayed together most of the night and he kept buying me drinks. one of my friends commented that it seemed like he really liked/wanted me. and sure enough we ended up going home together and slept together. I know this is a dangerous topic to bring up on TSR but it's worth mentioning that though I did probably quite openly fancy him, I was so drunk towards the end of the night and I don't remember going home or how it started and I barely remember the actual sex itself... so I do find it a bit weird that he'd still sleep with me even in that state... but then again I don't know if I was encouraging it, or what. (also worth mentioning I hardly ever drink excessively and this is the first time I've ever been that drunk, I don't make a habit of it, it was entirely accidental from too many cocktails!)
I feel horrible now because I never intended to actually do anything, and because I don't know if it's more my fault or his, I don't know if I should say anything to him or what? I don't know if he's going to ignore me now or act like it didn't happen, and I'm just not sure what I should do. Should I bring it up and acknowledge it or just pretend like it never happened?!