John Mayer may have boasted about his wandering eye on The Ellen DeGeneres Show, but he failed to mention his own jealousy issues if his partner did the same!

Breaking Celebrity News has exclusively learned that the 35-year-old wasn’t happy that his now ex-girlfriend, Katy Perry, 28, was still on friendly terms with her ex-husband, Russell Brand.

The lusty Lothario grew tired of Katy’s comparisons between him and the Brit comedian, and it created a tension between them that threatened to boil over at any point.

“John and Katy together were like a volcano just about to go off,” a source reveals.

“Their relationship was incredibly volatile, stemming from the jealousy they both harbored deep inside.

“Sure, Katy was unhappy that John constantly flirted with other girls and played up his heartbreaker image, even when she was standing next to him.

“But, Katy gave it back. She knew that she could push John’s buttons by comparing his flaws to what she saw was great in Russell, which he hated!