What do I do?????????? (help, slept with guy I barely know)?

Theres this guy who’s in some of my cles at uni, hes very shy, I catch him looking at me a fair bit and turns away when I look back. I said Hi, to him when ping by he mumbled and carried on walking. I noticed he gets alot of attention from girls as hes very handsome, however he never seems interested, hes comes across as unfriendly and distant. Anyway we were at a house party (lots of people from uni were there). He came up to me, seemed very confident and proceeded to tell me I was beautiful and how Im always on his mind and he really meant it, he said it seriously looking deeply into my eyes the whole time. He then took me by my hand and led upstairs to a bedroom, we sat on the bed and he started to kiss me pionately, especially my neck, we gradually stripped each others clothes off, by this time he was kissing me all over my body. We then had . The was unreal; it felt so good, like I was in a trance of pleasure. It surprised me as how warm he was considering how unfriendly, distant he is. Afterwards he rushed of embarred. Haven’t seen him in a couple of days. I’m going to have to confront him at some point, not sure what to say or do. Please note this is the first one night stand I’ve had, I’m not that type of girl. (we are both 20)