My heart goes out to you.

Granted you shouldnt have been kissing her but he never should have felt her breasts to begin with. And im sure he wouldnt have been happy with you sleeping with the male, where was her s/o when this was happening? Kissing her didnt necessarily start it as he was feeling her breast before hand. Did you consent to them going further?

If you want your marriage two work there are two very clear things that need to be done. You need to end your contact with this so called friend and both you and he need to stop drinking. You both betrayed your vows that night, and if you want the marriage to work you need to be sure it does not happen again.