Ok, not really.  She doesn’t even admit that ‘Dear John’ is about him, and says he’s presumptuous to think so.   I do love her mantra of putting a ‘high priority on being happy’.  Read some of her new interview here:
Taylor Swift on her songs about past relationships and not listening to the gossip…
Glamour: And “Dear John,” also about a failed relationship, still seems to be resonating strongly. Does that surprise you?
Taylor Swift: I think that song really hit home with a lot of girls who had been through toxic relationships and had found their way to the other side of it. I’ve never looked out while singing a song during a concert to see so many girls crying.
Glamour: You never identified who it was about, but John Mayer recently told Rolling Stone that it was him.
Taylor Swift: How presumptuous! I never disclose who my songs are about.
Glamour: He said he felt…
Taylor Swift: No! I don’t want to know, I don’t want to know.
Glamour: You don’t? [Mayer told Rolling Stone that he was "humiliated" by the song, and that Swift's releasing it was "a really lousy thing for her to do."]
Taylor Swift: I know it wasn’t good, so I don’t want to know. I put a high priority on staying happy

Read More http://www.glamour.com/entertainment/blogs/obsessed/2012/10/taylor-swifts-november-glamour.html#ixzz288maOLTH