I like this guy

So I have a have a huge crush on this guy in grade 12 I’m in grade 11 and a few weeks ago at a party we hooked up (we almost had sex) and I honestly wanted to do it with him. But the thing is he’s talking to a girl who I’m really close with we’re like sisters. I haven’t told her yet but I’m pretty sure they like each but then he’s always saying he likes me as well. I don’t wanna let this one go because I really like him, but I also don’t wanna hurt my best friend.