What happened to John Mayer?

I remember he got sick over in Europe and did a show in Vegas, but it's like he just up and disappeared... Haven't heard or seen anything about him in a long time. There's nothing on his web site either...
Update: Screw Taylor Swift. She knew exactly what she was getting in to, everyone warned her. John Mayer's an @$$hole... so what! His music is STILL better than most of the junk being put out out these days... He's one hell of a musician!!!
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