India, May 14 -- George Clooney's celebrated return to the stage in Good Night, and Good Luck may be winning him standing ovations on Broadway, but behind the curtain, his marriage with Amal Clooney is reportedly under increasing strain.

Why so? Amal is feeling increasingly sidelined due to George's growing passion for theatre. "They realize they can't keep papering over the cracks," one insider told Radar Online.

"Despite George's best efforts to try and smooth-talk his way out of the situation, the fact is they have virtually been leading separate lives for quite some time."

Since tying the knot in 2014, Clooneys have spent most of their time in a chateau in the South of France, their scenic Lake Como villa, and a countryside estate ...