I'm going to pursue a girl with a boyfriend
Why do you want to pursue her?
She initiated it. I'm going to pursue her even if she has a boyfriend. I like her.
You shouldn't pursue someone else's partner. That is cheating.
I'm just doing it because her boyfriend is mean to her and he doesn't deserve her.
Weather or not he is mean to her doesn't matter, she needs to break up with him first. Then she can pursue you. I think it's wrong to cheat on anyone for any reason.