I kinda had sex with my friend
It all started one night about 2 months ago when my friend (who is a guy) and I (I'm a girl) got really drunk, we were having a good time, everything was great and then I told him I had to go and he kissed me. It was weird but nice so I kissed him back. After that everything was as usual, we went out to eat, do our stuff, nothing sexual happened after that. Then he got a girlfriend, I didn't really care, I was actually happy for him, he introduced me to her, she's really nice and pretty, although she doesn't like to drink or get high or any other stuff he and I always do. Anyways, about two weeks ago he kissed me again, I didn't know how to react but honestly I didn't atop him either. We had sex for a week, I was like his "lover" but last Thursday I was thinking about it and I really don't like the fact that I am the one giving him pleasure and the one he has fun with but she's the one who gets the flowers and the attention. I talked to him, told him I wouldn't do this anymore but didn't exactly told him the way I really feel about him. The thing is we know each other so well, sexually and emotionally, we have so much fun together but still he's with her because "she's sweet".
What should I do? Should I tell him or just leave things the way they are?