Guys are funny, you made your choice, however having kissed the other 2 do you not think you may have led them on? If a girl kissed me and my friends I would not want a serious relationship with her!
Alcohol not you again!
Tell everyone the truth.
you did nothing wrong! you slept with a boy you liked; you don't owe it to his jealous friends to also sleep with them.
It sounds like you like the guy you slept with more than the other two (correct me if I'm wrong). It's only an issue if you want a relationship with any of them.