Affair

I had some friends over for my birthday and we all got pretty drunk, my friend brought her fiance and the more she for drunk the more she would try to convince me to sleep with her fiance, I wouldn't do it since I was less drunk and knew better. My friend passed out on my couch and her fiance fell asleep in my room, I went in after I cleaned up my house a bit( as much as a drunk person could) and was trying to wake him up to go sleep in the spare bedroom or on the couch with his fiance. He got up and I took off my clothes and I went to bed and thought nothing of it, when I woke up he was right next to me asleep in his boxers which he was fully clothes before..

We both looked at each other with a oh shit look and have no idea what went on prior to waking up. I don't think we did anything but I'm seriously confused as to why he was just in his boxers! I'm a terrible person for not locking or closing my door all way but I honestly thought he went to the spare bedroom. I know I was pr drunk and I know he was too but I don't know what to do from this point.