Replying to I need a bunch of random people on the internet to give me advice

okay ill try to keep this short.

my best friend was dating this chick who is also one of my friends. they broke up and then after they broke up she confessed that she had sex with two other guys the week before she dumped him. now my best friend hates her, but im still friends with her. this seems to bother him.

today i told him that i was gunna be hanging out with her and other people on monday. and he actually didnt say anything, he was stunned. so now i feel like shit because im caught between two friends... and i realize that this girl is a slut, but i always knew that (lol) and i dont really care, cuz shes chill. but it seems to really bother my best friend...

(sorry for the lack of structure in my paragrahs.....)