Reply #14: He's the one who behaved unethically [View All]

[Nikia]

Legally, it might be considered rape. I am assuming that you don't wish to press charges because of the tone of your email. It is ethical of you to tell him that he was wrong to do what he did and that you wish to never see him again. If you insist on being more diplomatic and seeing him again since he is aquainted with your friends, tell him that what happened was a mistake that will never happen again.
It is also ethical to warn other women about him, although I would understand your hesitance because of him being in your circle of friends.
I would recommend that you be more careful about drinking too much and/or hanging out with people who you can trust not to take advantage of you, including someone who will actively prevent something like this from happening to you. I would certainly never drink with him alone or without a trusted person to watch out for you.