back to previous memory...

why can i forget a past memory...it's hurt when the person u like most came to u and all the memory came to u...it's most hurtful...the month is past n i almost forget her but why she come back...too memory-able to me...i wish i can forgot her but i can't...i hope i can start new sem with my new life...but i can't when i see her around... my mouth say no but my heart say yes...please help me...ALLAH...