John Mayer has gotten all he can out of Jessica Simpson and has placed her politely back on the curb for her next customer.

As for why the two singers split, a friend of Mayer’s says, “John did say that he broke up [with Jessica]. He said that it was because he was just over it.”

But the pal says there is no other woman. “He’s fine about it, he’s not upset – but he’s definitely not looking for someone right now.”

A source who spoke with Mayer recently says the breakup came as a surprise: “Whenever I’ve seen them, they’ve been tight and together. I’ve never seen them argue or anything.”

Still, Mayer didn’t appear to be taking the split too hard on Thursday. The rocker stayed out until nearly 4 a.m. partying at New York hotspot Stereo. He sat at a back table in the VIP area where he drank two glasses of Jack Daniels and hung out with friends, according to sources.

Jessica’s about to start craving that marriage to super Nick she once had. She has been out, had her fun, and been driven into a few backseats by now.  Ole’ Nick doesn’t sound too bad now does he?