Drunk sex UPDATE

M
Known this guy for 3 years already. Good guy, not the type to have as a bf in my opinion. Anyways about a week and a half we had a few drinks and one thing lead to another. We had unprotected sex but he didn't finish. And now I just can't stop thinking about about him. And also wonder why didn't he finish. Could've been the alcohol? Any of you guys deal with things like this? Thanks 
Update: 
So I texted him about an hr ago to see if he wants to go out to have some food, (we were good friends before the sex always hanging out) and he replied with "The d**k was that good huh?" I didn't reply, I felt completely dumb and used. After reading his text. Now my only concern is that I hope I'm not pregnant by this fool, He didn't finish and it wasn't during my "green days". I'm just feeling really stu**d right now 😖