I wasted most of my college years chasing after this one girl who instantly became my "type". I didn't want to bother with anyone else, couldn't stop thinking about her, felt great when I was around her and horrible when not. I would do anything just to talk to her on the phone.
We hung out plenty, she was a good friend and I was crazy about her. I kept misinterpreting her "signals" that she was into me as well so that kept me going. Plus I got a lot of self esteem from being around a hot chick that my friends and co workers were a bit jealous.
But when I finally mustered up the courage to tell her point blank I had feelings for her, she told me she did not feel the same. I wasn't surprised, but it floored me. You know that song Wicked Game by Chris Isak? That was me. This was right about at the end of my college life and I realized I had wasted it pursuing her.
We stayed friends for many years post-college and I watched as she had relationship after relationship while I was still struggling to have one of my own. I think this experience really screwed my self esteem up for several years even after moving out of town. I just couldn't get past her.
tl;dr -- read from here down
I'm happily married now and my best advice to those in a position like I was is this:
If it seems hard, it's not meant to be. I was always begging and pleading to spend time with my college crush. It was *hard*! When I finally met the girl who became my wife, it was *easy*. The big difference? My (future) wife was interested, the girl from college was not. It doesn't get more simple than that.
I will qualify this with the fact that it gets easier as girls get older. Teenagers or 20-somethings will play hard to get or other games. As they get older (and more desperate), they drop that crap and you know when they like you.
There's nothing worse than the "so you're saying there's a chance!" feeling from Dumb and Dumber. Let it go. Find someone who wants you as much as you want them. There's always someone like that. It's only a matter of time.