it's been a year and I still can't get over it

It's been a year since my 2 year relationship ended and apparently I haven't really got over it. I find myself thinking about him all the time. I thought I'd got over it, and I've gone through some many phases of the break up: getting crazy drunk and party, and having sex, to crying my heart out for months every night, to be obsessed with sports so I'd be exhausted enough to just fall asleep every night... I have dated other people. Some just to get away with but others not. I tried my best to love again but i just can't. Not the way I did. And it's so frustrating because at the end of the day he's l I think about. How I never know and I still don't now if I should've done more. I even moved to Europe to do my internship thinking it would make me get away from all the memories and start over with myself. But the truth is I don't know why some part of me will wants him so bad. We were so in love. He was always a weak person who wasn't good at making desicions. We never talked agin like before, just recently that I'm away that he send me his new songs and one of them he wrote for me. While go. The thing is: how do I know if I should really let him go forever? Or should I try (as I never did when we broke up) to start again after al this time?