In order try to get a friend to break up with her jerk boyfriend, I sent him fake texts that looked like they were from another woman.
Oh wow! Did it work?
No, and it made her feel horrible because she thought that she wasn't enough for him.  In the end, it wasn't worth it.
I bet you felt really bad. Did you end up telling her the truth?
No, I just stopped and let the whole thing fade away.