Is it wrong that during the last few months of my last relationship I couldn't stand my ex?
Why did it become difficult to stand your ex?
I realized that my ex is a lying bastard and I'm over him.
If your ex was lying then I understand why you wouldn't want to be with them. You shouldn't be in a relationship that you hate.
I just wanted to break up with him but I wanted to do it in a way that would hurt him the most.
It's normal to want to leave a relationship that makes you unhappy. This is something you will realize as the relationship is in it's final stages and no one is willing to change.