Why cant i just get over her?

Dude, I had the same thing happen with me and my current girlfriend! We were always friends and I always liked her, but she never liked me that way. I always tried a little too hard, but one day I just decided to act like I didn't care... and she liked me. I was myself, nothing more. I think we have very similar situations, so maybe it will work out for you like it did for me. Good luck dude x