Here’s another theory as to why Jennifer Aniston and John Mayer called it quits: She dumped him because he’s addicted to Twitter.

Sources tells Star magazine Aniston was furious that the singer would claim he didn’t have time for her but spent time on the site. “She was like, ‘He has time for all this Twittering, but he can’t send me a text, an email, make a call?’ He didn’t deny it,” a source said.