Man, I've read a lot of bad things on here but you may have won.

Your wife must feel so humiliated. Her friend must feel so icky.

Alcohol is no excuse.

The thing you did was in inside you and alcohol let it out. I kinda refuse to accept the excuse of wanting to comfort the friend.

My suspicion is that you're freaked out about the commitment of getting married and have a tendency to self sabotage.

I don't think abstaining from drinking is going to be enough to save this level of screw up. Curious to see what people think could help.