Yah man. .give her up,move on.you know,i faced same problem. Bt finally something helped me.
Im a little bit stubborn so that i couldnt also forget some girls who ignored me several times. As more as they ignored me,as more as i got addicted to them. . But finally realized, thats what turns me on,makes me weaker,ruins everything i learnt,i did. . Then i use to act like a total AFC needy guy.fuck. . . I really hate that feeling. But once i just fucked that matter,let it go. .and you know what ? She got mad at me

. May be it was just a test or technique to take all the powers from me. . But i didnt let her. . . To forget anyone./break one-itis/heal the broken heart

.
*delete all her messages,pics that you picked together,contact or anything that reminds about her(it also help u believe she is gone)
*make your subconsious mind believe that itz over
*stop listening sad/romantic songs
*stop daydreaming/fantasizing
*stop going places that u used to went together
*most importantly,sarge other girls,
*hang out with friends.