Miranda Lambert and Blake Shelton’s divorce looked like it came out of the blue, but it was instigated by Shelton, who got wind of an extra marital affair.

The country singer got information his wife was cheating on him, not once but twice, which is what led to the breakup after four years of marriage.

TMZ reports…

“Blake Shelton filed for divorce because he believed Miranda Lambert was unfaithful, not once but twice … TMZ has learned.

Multiple sources familiar with the situation tell us … Blake has suspected Miranda was living out a country cheating song for months. We’re told Blake heard rumours Miranda had hooked up with country singer Chris Young and thought it was believable enough to make him suspicious of her.

Young opened for Miranda a few years ago, and the 2 were spotted out publicly from time to time. But our sources say Chris was NOT the catalyst for the divorce. It was another guy, who is not a country singer.

Our sources say the reason Blake filed 2 weeks ago was because he received certain information about Miranda and the other guy that elevated things in Blake’s head from rumor to fact”