Okay, so I was invited to a party last Saturday by a guy that I met like three or four weeks ago and I was supposed to go to the party with my friend but she kind of ghosted me so I went by myself and it was a cool little party, it was about like 15-20 people there I didn't know anybody besides the guy that invited me and I did see one of my closest friends, her boyfriend was there and since I already knew him, I kind of just like hung around like him and whoever he was talking to and long story short, we were drinking a lot and we were flirting and I thought, okay I'm flirting with him but it's innocent or whatever but eventually he started making a move on me and started touching me and we started kissing but that's it, we didn't have sex but it's Wednesday and I haven't told my best friend about it and I feel like shit and I'm trying to figure out whether or not I should tell her because I really don't want to lose her as a friend but I'm really scared, I'm really sad about it, what should I do?