John Mayer, 34, may have cancelled the upcoming tour he had planned due to throat problems, but his new album, Born and Raised, speaks for itself — at least in the single "Shadow Days," which is rumored to be about his ex-girlfriend Jennifer Aniston, 43 from whom he split up three years ago.

"'Shadow Days' is about Jen. It really took him a long time to get over her," a source told Us Weekly about Mayer. "He really loved her a lot."

The lyrics of 'Shadow Days' reveal that the song could certainly be about a breakup. "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."

"He wrote the song as a farewell letter knowing [Jennifer Aniston] would hear it," said the source. "Ultimately he's done a lot of self-reflection, though, and he realizes they weren't right for each other."

After being linked to Aniston and a string of other famous beauties like Jessica Simpson, Minka Kelly, Taylor Swift, and Jennifer Love Hewitt, according to MTV, Mayer is ready to settle down with a "nice, non-famous girl he can relate to." Aniston, in the meantime, has appeared to find happiness with actor / director Justin Theroux, 40.

Born and Raised drops on May 22.

Watch the music video here and decide for yourself if it's a "farewell letter" from Mayer to Aniston:

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