LOVE 15 need help :S Plz?

im inlove with my ex gf and really love her and tryed well too many times to forget her but evry day i see her and really wants me to get back with her and she does kinda like me and kinda flirts with me but she does the same with other guys too :( i dont really know what to do and tbh im a 15 year old boy you dont get that often :C YAHOO HELPPP............. plzzzzzz