John on Breakup with Jen: There Was No Lying, No Cheating

Photo by: Tzirel Kaminetzky; Lester Cohen / WireImage

Though John Mayer and Jen Aniston were decidedly mum about their romance, the singer is opening up about their breakup.

"There's no lying, there's no cheating, there's no nothing," Mayer told reporters about his split with Aniston after working out at an Equinox Gym in New York's SoHo neighborhood.

If anything Mayer had only praise for his ex, saying: "Jennifer Aniston is the smartest, most sophisticated person I think I have ever met."

So what went wrong? "People are different, people have different chemistry," said Mayer, who appeared emotional, nervous and sad. "I ended a relationship to be alone, because I don't want to waste somebody's time if something's not right."

Sources confirmed that the duo, whose whirlwind romance began in April, mutually decided to split earlier this week.

Since the breakup, Aniston and Mayer have settled into their separate lives on different sides of the country.

by People.

Aniston 'Fits Right In' with Mayer's Concert Tour

Photo by: Fame Pictures

John Mayer's newest roadie – Jennifer Aniston – has been a welcome addition on his tour, say his pals.

"John has such an amazing crew of musicians and friends with him. Everyone gets along and is drama free and Jen fits right in – perfectly," says a Mayer friend. "Everyone really loves her."

At a recent concert in Chula Vista, Calif., Mayer's girlfriend continued to be the subject of fans' anonymous text messages that were displayed on twin screens between acts. One said, "We want Jennifer Aniston to come out now!!!"

Though continuing his less talk, more music approach to his concerts, Mayer rehashed his concerns about recent media coverage of his tour.

"It's kind of a new thing for me to have my stage banter scrutinized. They have been printing everything I say," Mayer told his audience.

But even if the media coverage is exhausting, the source says Mayer, 30, is happier than ever with Aniston, 39.

"They are very happy together, it's working really well and they're only getting closer," says the Mayer pal. "His friends think she's great for him."

John Mayer's Shocking Confessions

John Mayer and Jennifer Aniston Photo by: Pacific Coast News; Marcel Thomas / FilmMagic

Jennifer Aniston and John Mayer were together again for the second stop on his summer tour, which hit St. Louis Thursday night. But rather than acknowledge her presence in the crowd, Mayer teased his audience about interest in his personal life.

"[Fans] send me links from PEOPLE," he said, marveling at the coverage of his remarks the previous night when he – with Aniston in tow – joked about being the subject of Internet rumors. "That just tempts me to say things." The audience at the Verizon Wireless Amphitheater in the St. Louis suburb of Maryland Heights roared its approval, but Mayer would not divulge any intimate details.

Instead, he playfully peppered his nearly two-hour concert with dubious confessions designed to feed those who were curious about his private life: He fears the color green. He weighed 400 pounds when he was 12. He wrote the lyrics to the Kenny Loggins hit "Danger Zone" – at age 9. And he was "33 percent done" with building a time machine.

"When I was a child I would kill small animals and wear their teeth as necklaces," he deadpanned. "True. Print that. And I've always felt deep down that I was born a woman."

Aniston remained out of sight during the show, but she watched Mayer's pre-concert soundcheck from the fifth row of the amphitheater, according to radio contest winners who sat a few rows farther back. She wore a slate-colored dress and a cardigan in the damp, late-afternoon air. "She looked like Colbie Caillet," said a witness, referring to the "Bubbly" singer who served as Mayer's opening act. "But it was definitely Jen."

Other fans clearly had Aniston on the brain.

During musical breaks between acts, the twin video screens flanking the stage displayed anonymous notes sent via text message from the crowd. "Team Aniston!" wrote one.

The most brazen of the bunch, preceding Mayer's own onstage joking: "John, I'm pregnant. – Jen."