Need advice!! Guy friend kissed me but I have a boyfriend

So I jumped into a relationship just a couple weeks ago with a sweet guy, we definitely rushed into it and I've been having a few doubts but last night one of my good guy friends kissed me, we were both drunk and not really thinking but it was so amazing. Felt super right and now I can't stop thinking about it but I feel absolutely terrible about it too. I know I have to end things with my boyfriend but I'm nervous and really stressing about what I'm going to do. Help?!?