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

By Laura Hahn

08/16/2008 at 08:15 PM EDT

Though John Mayer and Jennifer 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 Saturday 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.