Party BJ

i fancy this boy, we'll call him john, however, i have a boyfriend. I went to a party last night with john and we were kinda flirting all night and we finally got alone and he kissed me. We walked away from everyone else and went up the driveway to the road where he fingered me and i sucked him off. The road wasn't busy as the party was in the middle of nowhere. Anyway, we then realised everyone else was following us and he came and we just went back to everyone else as if nothing had happened. Everybody had worked out that we had kissed and the boys were being kinda mean to him, i told my two best friends the other things we had done. We got a lift home together with two others and he didn't speak once in the car and he hasn't spoken to me since. i haven't told my boyfriend anything even though everyone is telling me i should. I was messaging my guy friend about it and asking him for advice when i got a message saying 'it's john, i regret every second of kissing you i was drunk and it will never happen again' but i don't believe it's john and it's just boys messing around. I don't know what to do and i'm really hurt. Any advice?