Nate Diaz does not get along with his bosses at the UFC, most recently being suspended for using homophobic slurs on Twitter.
So in an effort to not have to deal with them anymore, Diaz tweeted at UFC and president Dana White asking to be released from his contract, on Twitter:
@ufc @danawhite I would like to request to be released from the @ufc Its time for me to be on my way .. ?
— Nathan Diaz (@NateDiaz209) February 26, 2014
The Diaz family as a whole seems to dislike the UFC as Nate's brother, Nick, recently retired because he was unhappy that he was not being given another title shot.