How to get over a crush?

So I've liked a girl for a little over a week now (I'm a girl too btw) and its developed into a pretty decent crush. But now I realize I need to move on because one she has a boyfriend two she likes one of my good friends and three I'm pretty sure she's straight. My friend likes her too (it's a guy) and she apparently doesn't like her bf all that much so their probably going to get together soon. Their always really flirty with each other, and the guy is always talking to me about her cuz I guess I give advice to him about her. So it's tough to watch. I thought she might've liked me back for a little while cuz she was kinda flirty with me a lot, and recently she wanted to work on the same station with me alot. And I've seen a few rainbow things she's had so I assumed that was bi. But I'm almost positive I was just reading into everything now so I really need to know how to get over her. No one knows I like her that way, and they don't know I'm bi. There's a few guys that like me there and she knows. But I really just want her. How do I move on?? Cuz I highly doubt anythings gonna happen between us thanks