You're going through a very difficult time - welcome to the PC forums. We are here to support you.

Of course, I can't tell you why you cheated, but it sounds like alcohol was definitely a factor and simply you made a choice you wouldn't have made under normal circumstances.

It's good that you were honest with your partner and that the relationship isn't broken. This is about the two of you...that is priority. Anything that can be done to have all the intrusive outsiders butt out while you repair your relationship is important, I think. It sounds like they are fueling into the drama. No drama is helpful here.

What steps are you taking with your partner to reestablish trust? Couples counseling may help. Good luck.