I'm going to catfish my best friend's trash boyfriend.
He does not respect her at all, and this will get her to break up with him.
He has no kind of respect for her, and this will get her to break up with him.
I get you want to help your friend, and that's good, but using the internet to deceive her boyfriend is wrong. It will just sow distrust between you and your friend, as well. You should just be honest with her about him.
I just want her to break up with him so that she can find a more successful boyfriend and I think this will be just the thing to do it.
I'm happy you want to help your friend out, but how would she feel if she found out her best friend betrayed her like this? Perhaps there are better ways to go about this, like just telling her up front. Don't you want to keep being best friends?