Curiosity + Alcohol + Opportunity + Insecurity = A very bad combination.
Impulse control went out the window and now you are living with the regrets. I don’t think you are a sexual offender – although you did do something that’s offensive. Only you can decide if confession in this case is good for your soul or if you will only be transferring your angst onto him. If you would be unburdening yourself by giving it to him, I don’t know as that’s fair or helpful. It might be more to the point for you to turn to your religion and ask for forgiveness there. Then do something generous and charitable as an atonement. And for heaven’s sake: Don’t drink even 2 – 3 glasses of wine if it’s going to cloud your judgment so much!
I wish you well.