Nobody knows what he was actually going through and what was the exact reason. People are assuming on their own. As per his close friends, Sushant was a carefree boy. He was a fun-loving soul, in initial times also he has refused some stories from big directors just for the sake, he wants to perform the character that he will live in. Not just acting, he lives in the character. Also, his friend said, he knows to live cheerfully when he has no work. So, that might not be a reason for depression. There was something big going on in his mind, that only he knew. Stop assuming things, and just love and pray for our hero that wherever he is, he live peacefully.