lust, charliehunnam
I read (on ONTD of all places) one idea for revenge on a cheating ex and I haven't been able to get it out of my head since.

Call him up, tell him you know what he did, watch while he apologises/grovels etc...after a few hours go "it's alright baby, we'll work through it", have sex and then AS SOON AS YOU ARE DONE HAVING SEX, become an untouchable ice queen and kick him out that minute, telling him to fuck off and die.
Tl;dr use him for sex and then drop his useless ass.