let go? move on? i doubt so..

can anyone tell me, how can i totally let go and totally move on. everytime i thought i already let go n moved on, i realised that i have not.. what can i do or how can i go about it.. it a torture to me.. really it is.. i thought i have let go really let go, but i guess i ignore the fact n just pretended.. how.. can someone tell me how?? do i really need 2 years or so.. or this time i need a even longer time.. sigh...... what can i do to know feel that heart aching anymore...