I'm happy that my ex-boyfriend cheated on me. Is that weird?
That depends, what specifically are you happy about?
I hate him; I've always imagined what it would be like if he cheated on me.
Well, if you hate him, that means you should move on. Don't dwell on his infidelity.
No I just want to get the guys that cheated on me. I'm going after them and my ex will regret it.
Revenge won't solve anything, trust me. The quicker you separate yourself from this person and the memories, the better.