What should I tell him?

You apologized. If he requires further explanation, be honest..and then ask where he disappeared to for so long. Otherwise, drop it.

You might consider not drinking that much at parties. You might get in bigger trouble next time. Be careful.

All you can do with the guy you have right now is tell the truth. It will be up to him as to whether or not he will be able to forgive it. It might be too hard for him to get it out of his mind. If it is you might just have to respect that and move on.

Learn from your mistakes.

Question yourself how much you really like your boyfriend. If you really do like him a lot and what this to last, then be prepared to be honest. Tell your boyfriend what happened so that he doesn't have to find out from someone else (he WILL find out) and be completely honest with him. Tell him it meant absoutely nothing, that you were drunk off your mind, and that he is the only one you care about.

Yea you tell him. He is going to find out. If I were him I would be extremely pissed at you and I would probably beat the crap out of the other dude BUT I would want to hear it from you and not anyone else. Be honest. You may have a chance to get him back once he flips out but at least you have honesty on your side.

Just tell him you're a ho and get it over with. Chances are good that other people have already told him. By the way, drinking is just a "convenient excuse" to get away with stuff like this.

if u thought that he knew a little bit of anything happend try to tell him that u r sorry bout anythin happend n tell him u was drunk too n am sure that he could forgive u.... n if he didnt know anythin n didnt saw anythin plz dont tell him.. but try to not doin that matter again...

I suggest you tell him before someone else does. I don't know what the outcome will be, but you need to control his drinking.

I would come clean with him, it is better he finds out now from you rather than later from someone else. That way you can resolve it now and not have more drama later to deal with.

Your mind was subconsciously telling you that you want to move on. I would suggest that you break off ties immediately and move on. You might think that it's worth fighting for, but chances are that it won't last.

Well, you were wrong to begin with. You should tell him before someone else that saw it does. It willl be better from you.