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Too drunk I can't remeber

My flat had a few people over for drinks the other weekend, I ended up drinking far too much and have a good 3-4 hours where I cannot remember a thing. I remember leaving my flat and going to another, but have no recollection of what happened there or how I got back to my flat. The next thing I can remember is being up against my door getting with this guy. He was then meant to come over last night and all the other people in my flat think he was coming over to sleep with me. the thing is, I can't remember what happened between us that weekend, and I can barely remember him. People in that flat that we went to keep making comments about what happened between me and him, and in all honesty, I'm actually so embarrassed that i got that drunk in the first place.
Just wanting people's opinions on this please.