Heads up bro, I recently went through samething...
Best thing to do is keep yourself busy and get rid of all things that'd remind you of her e.g. Pix, gifts/things she's got you and delete all...
I know it's a sin to have sex before marriage but is it true if you take a girls virginity and you end up breaking up with her, after you who ever she has sex with the sin is on the person that's...