John Mayer showed up at Gallery1988 in L.A. in support of his pal Pete Wentz’s art show: “Without You I’m Just Me.” He arrived early, posed for pictures and then left before his ex, Jessica Simpson arrived.

An unnamed source said:

“John showed up early for the public viewing and took pictures with fans, but left before the VIP portion of the evening started. He wanted to be there for Pete, but wanted more to avoid the possibility of a dramatic encounter with Jess.”

John is now dating actress Jennifer Aniston, and Jess is dating football pro Tony Romo. I wonder if he would have stayed longer if Jen had been with him?