Mordecai and C.J decide to break up for a bit because CJ still thinks Mordecai loves Margaret, but its really because Mordecai is really bad at admitting his true feelings for C.J.

Does CJ break up with Mordecai?

Trivia. This episode is the season 6 finale and finally deals with Mordecais relationship issues. Mordecai and CJ officially break up. It is revealed that Rigby and Eileen have been secretly dating for a few months.

Why did Margaret dumps Mordecai?

She served as Mordecais love interest throughout Seasons 1-3, and they kissed and dated in Season Four. They broke up after Margaret left town for college in Steak Me Amadeus, and after she returned they agreed to remain just friends.