Is it a bad idea to tell a FWB that you can no longer see them because you've developed feelings?

FWB is something boys created because they are not mature enough to hold a relationship together, so dont get involved with someone who just wants to be your fwb, its crazy and the girl will always get hurt in this situation, because it was a guy who thought it up to suit his desires as a boy, no man would dream of this, dont allow your talents to be used by anyone, no matter how they make you feel, good luck.