Dang Girl, What Did You Do To Me? in General Randomness

So there's this girl I like but I'm pretty sure it won't go anywhere, she just doesn't seem that interested in me. However, she is the only woman who has ever made me want to be more than I am, made me get out of my comfort zone. There is stuff that I would never do for any other girl that I'd do for her, i.e. I went on a ski trip even though I hate skiing and cold and snow. I've considered learning Salsa dancing because I know she loves it, even though I suck at dancing and have no rhythm. AND NOW!!! She participating in a 5k run. Although I do love running (training myself for if the Doctor in his blue box ever shows up needing an America Companion. It could happen don't laugh :P ) I do like running but I don't think I could handle a 5k but because she is doing it I want to. I would never have done this for any other girl, why her?