I'm going to turn my ex's friends against her. Think that will teach her?
what did your ex do to deserve that?
She cheated on me before we broke up, for that I want her to suffer.
Being upset at your ex is fine but you're messing with her life out of spite. People are going to think you're obsessed with her if you keep trying to do stuff like that. Just move on and you'll be much better off.
Nah, I don't care. I'll do it and turn her life into hell.
You don't need to spend any more time thinking about her. What she did was terrible but you are just making matters worse and it makes you look like you can't get over her.