AGONY: I can't get over my ex!

AGONY   LOVE & RELATIONSHIPS

I dated this guy for six years and for the most part, it was a fun relationship. But along the way, we got some issues and cheated on each other. 

And while he said he was sorry he had cheated, he could not forgive me for cheating on him and we broke up. 

The problem is that I cannot get over him. It has been a year since we broke up and I have no interest in other guys. How do I get over my ex?