Why would you leave town after someone broke up with you?

So I broke up with someone about a month ago for cheating on me. When I didn't take him back, he said I'd never have to see him again and that he was leaving town. I think he actually did, but that strikes me as a really odd thing to do (he's only lived here for 2 years, but he has family here that he said he wouldn't leave) so I was wondering if anybody else has ever done this or what would cause it?
Why would you leave town after someone broke up with you?
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