Kanye West 'is anxious and very sad' as he's been having a difficult time amid a growing sense that his marriage to Kim Kardashian is coming to an end.

'Kanye is not doing well,' an insider told People Wednesday of the 43-year-old star. 'He knows that the marriage is over, and there's nothing that can be done right now.'

The Grammy-winner 'also knows what he is losing in Kim,' the source told the outlet of the celebrity split, as divorce papers have yet to be filed.