Rob Kardashian left a heartbreakingly sad comment on Snapchat and fans are worried.

Rob Kardashian had always famously stayed out of the spotlight, until his relationship with baby mama Blac Chyna. But now that they've split, he's disappeared from the public eye again. On Friday, a fan account called @KimYepictures posted a throwback gif of Kardashian singing and dancing while holding his nephew Mason on both Twitter and Snapchat, saying "I miss you so much Rob."

And the saddest part was, Kardashian responded with the comment, "Me too," with a blue heart emoji.