Michael and Goss first got together in 1998 and were together for about 13 years, but even after breaking up they supported each other, reported E! online.
"I'm heartbroken with the news that my dear friend and long time love George Michael has passed. He was a major part of my life and I loved him very, very much.
"He was an extremely kind and generous man. The beautiful memories and music he brought to the world will always be an important part of my life and those who also loved and admired him," Goss said.
"Its a Xmas I will never forget finding your partner dead peacefully in bed first thing in the morning...I will never stop missing you xx," he tweeted.
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