I go after women in relationships
Why would you pursue women who are already in relationships? Thats terrible!
I find the idea of breaking up their relationship really fun.
You should consider whether going after women in relationships is a wise thing to do. You might cause a lot of trouble and heartache in others' lives. If that is what you consider fun, you might want to think about your morals.
I don't care about others. The target deserve it, she deserves to be hurt.
Why does she deserve it? It sounds like you have issues with women since you don't care what forcing them into an affair would do to their partner. You might need to talk to someone to get over your dislike for women.