What do I do if I really like this girl, but she has a boyfriend? We have so much in common and everything.. do I just try and get over it?

She has a boyfriend. Which means she is off limits. Walk away and find someone else.

She's off limits. If you really like her, then continue to ONLY be her friend, if you can handle it. If one day she breaks up, then you can give it a shot.

But definintely do not put your life on hold to wait for her.

Thanks.

Off limits, she has already found someone