Please help!!!! I have a crush On my best friends boyfriend?

I have a huge crush on my best friends boyfriend. My best friend and I have a love hate relationship I wouldn't mind losing her honestly but we always crawl right back to each other. I'm going into the 7th grade btw. So I don't really think the relationship is a big deal. A couple of days ago at a pool party he was comforting me cause I was upset and I just told him I was cold not and he gave me his towel and then my best friend and him where both crying cuz they where gonna miss eachother:( what should I do?!