John Mayer's new song is about Jennifer Aniston. Allegedly

Take that Angelina. You may have everything and a French castle, but do you have a self-centered John Mayer pimping out your old love affair? I think not. Us has this:

"John Mayer is finally ready to let go of Jennifer Aniston - in song. WHAT A TROOPER. Although they split nearly three years ago THAT'S LIKE 47 YEARS IN CELEBRITY TIME, the 34-year-old singer (whose exes also include Jessica Simpson and Jennifer Love Hewitt IF YOUR NAME DON'T START WITH "J" YOU DON'T PLAY) penned his single "Shadow Days" (from the album Born and Raised) with Aniston, 43, in mind. "Shadow Days is about Jen," a source tells Us Weekly. "It really took him a long time to get over her. He really loved her a lot." Sings Mayer in the song: ""You find yourself alone. . . I found myself in pieces/ On my hotel floor/Hard times help me see/I'm a good man with a good heart/Had a tough time, got a rough start/And I finally learned to let it go." GOOD TO SEE IT'S ALL ABOUT YOU. Explains the source: "He wrote the song as a farewell letter knowing [Jen] would hear it. UNFORTUNATELY, SHE'S BUSY SNUGGLING WITHT JUSTIN AND WON'T BE TURNING ON THE RADIO ANY TIME SOON. Ultimately he's done a lot of self reflection though and it he realizes they weren't right for each other." The rocker and the Horrible Bosses actress first got together in April 2008 and, after multiple breakups, called it quits for good in late 2009. Aniston has been happily ensconced with Justin Theroux for over a year now. "[John and Jen] weren't right for each other, but he is really a good guy." After high-profile flameouts both Simpson, 31, and then Aniston, Mayer is done dating celebs, the source adds. "He's looking for a nice, non famous girl he can relate to PLEASE SIGN UP AT ORDINARYYETHOTCHICKSFORJOHN.COM . . . He loved [Jen and Jessica] both but it really affected him emotionally and it wasn't worth it."