This is when you arrangement with a friend with benefits ends, due to other party beginning a monogamous relationship, etc. Or its when a tryst suddenly drops off the face of the earth due to family commitments during major holidays.
A: Oh look! I got an email from Joe!
B: Is that one of your friends with beneis? What does it say!?
A: (reading) Message body:
Just wanted to let u know that I won't be stopping by anytime soon. I met someone and while its still new, I don't want to fuck this up, and I would if I played. He knows I like to play but he ask's that I don't while we see where this goes. It was a fun run.
B: Guess that's a Friends no mo' benefits with that dude. Bummer.