Though Selena Gomez has poked fun at Justin Bieber once or twice since their breakup, he refuses to engage in a war of words with her.
A source tells RadarOnline.com that Justin has instructed friends "not to fight back" because he "doesn’t want to fuel the fire and he just doesn’t want it to be that way with her. ‘I don’t want anyone saying anything negative about her,’ is what he told his pals.”
Last week on Late Show with David Letterman , Selena quipped that she's made Justin cry in the past.
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