"Chuck" star Zachary Levi is newly single!

"He broke up with her on Saturday after his big NBC premiere aired," the pal explains, adding that the couple had recently returned from a "great vacation" in Turks and Caicos and Puerto Rico.

Look back on the biggest celeb splits of 2009

Levi's reason? "He told her it was bad timing and if God brings them together in the future it's meant to be," the pal sniffs, adding that "this isn't the first time" the actor has tried to end things with Crosby.

"Guess he thinks he's too big a 'star' now," says the source. "No more Mr. Nice Guy."

Honestly, who is this dude?
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