This can't be happening?

ok a guy I've liked for 2 years now likes my best friend who's only been here for 3-4 months now. I mean why we barely in her in mean ya she's pretty and nice most of the time. should I just give up on him cuz its never gonna happen or keep trying? I need answers he's already dated 2 of my best friends but I stepped back cuz I didn't want a stupid guy to get between our friendship then he likes her I don't really care then I just figured that was life but now that I'm starting to understand life. for some reason I cried when I found out he liked her I have a hard time breathing I feel like I'm gonna puke when I'm around them together and alone. what should I do? give up? or keep trying?
This can't be happening?
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