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“Game of Thrones” star Kit Harington secretly checked into luxury rehab for stress and alcohol use ahead of the show’s ending, which “really hit him hard,” multiple sources have exclusively confirmed to Page Six.

Exhausted Harington, 32, who played Jon Snow on the hit HBO series for eight years, has been at luxury Connecticut health retreat Privé-Swiss for nearly a month, arriving weeks before the show’s finale on May 19, Page Six has learned.

The British actor has been undergoing psychological coaching, practicing mindful meditation and cognitive behavioral therapy to combat stress and deal with negative emotions at the facility, which costs over $120,000 a month.

His actress wife, Rose Leslie, 32, whom he met on the set of “GoT” and played Jon Snow’s Wildling companion Ygritte, is being “extremely supportive,” we’re told.

A friend told Page Six of Harington, “The end of ‘GoT’ really hit Kit hard.

“He realized ‘this is it — this is the end’, it was something they had all worked so hard on for so many years. He had a moment of, what next?

“He’s in the clinic predominantly for stress and exhaustion and also alcohol.

“His wife Rose is being extremely supportive. Everyone close to him really wanted him to get some rest. Right now, he just needs peace and quiet.”