How do you get over a long, recurring crush?

PaulAtreides
there's a girl I know from my early teens who I went to school with and ended up in the same university doing a similar degree. I've always had a thing for her and every few years I try pursuing her again and every time it amounts to nothing. we've made out and messed about once, but that was like 5 years ago.

I know I'll never actually get a chance to date her properly, I'm not what she's looking for and she's also one of my sister's best friends so that's a problem too.

So I guess the real question is how do I get over her / forget her when I'm constantly seeing her on campus or through my sister.
How do you get over a long, recurring crush?
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