I'm going to make a move on my friend's ex
Why would you want to date your friend's ex?
I don't care about her feelings, I just want to take advantage of the fact that he has moved on to someone else. I want to get revenge.
You shouldn't make a move on a friend's ex. That is their ex and you should be loyal to your friend. That will hurt them.
My friend is not a good person anyway.
It doesn't matter if that person is a good or bad friend. There are unwritten rules that people follow. Not dating a friend's ex is one of them.