The musician, who just broke up with Jake Gyllenhaal, has a habit of writing songs about her ex-boyfriends.
If she does vent about the breakup, Gyllenhaal, 30, surely will hope to avoid the fate of John Mayer, who was linked to Swift romantically and was widely believed to be the inspiration for "Dear John," a biting ballad with lyrics about an older guy who "messed with" her.
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