How to get over a Cruel Crush?

My crush was cruel, jealous, overcompetitive and played a lot of games. He was horrid. I remember all the things he did to try and bully and humiliate me, just because he felt inadequate, he felt small, his friends were being nice to me and he hated that. He turned everybody against me, and when i gave him what he wanted, well actually what i wanted, which was too ignore him and pretend he were invisible, he became livid. He'd go out of his way to try and be close to me, yet when other people were around he'd act like he couldn't stand me. How insecure, and immature. I lost my job because of his jealousy, insecurity, desperation for attention. He was such a jealous prick. How do i get over being treated badly by such a low cl roach, he's a bully and a waste of space, how do i get over his cruel behaviour?