Rob Kardashian's Family Scared for His Life After Massive Weight Gain

Rob Kardashian has given up on life again, retreating to the confines of his home and gaining all his weight back ... so claim members of his family who are worried his life is now in danger.

Our Kardashian sources say ... Rob and Blac Chyna have split, and he's been living at his own home for nearly 2 months, almost never walking out his front door.