honey is hard....I'm with you in your pain...but MOVE ON....that needs time...don't waste more years on him...he's out....don't let him to occupy all your mind and thoughts....it needs effort...then little by little you feel stronger and more secure each day and you will find a better person in your life....
I'm same like you...although, my relationship was just a short term but I have difficulty to let it go....but I'm trying so hard....I know there is no go back....He's with somebody else...and I respect the fact that he doesn't want me....I have to let him go...same thing if I don't want somebody, I want that person to let me go....
Move on...do new things and each time that he comes to your mind, just pray...then you will forget all about him....it needs lots of effort....
good luck
Marjan