This is sad.

Rob Kardashian hasn't been seen in public for months - and pretty much years, for that matter! - and the reality star just admitted that he misses the way he used to be.

"I miss u so much Rob 😩😭❤️," a Twitter fan wrote on an old GIF of him and nephew Mason. "Me too 💙," he responded. This breaks our heart!

Kimmy K's bro has had a rough road, dealing with everything from depression to weight gain, and his baby mama drama with Blac Chyna isn't helping things! The former stripper is going after him and his family in court, and she has no plans on backing down anytime soon.

"Chyna is really not interested in settling any of her court cases. It is not about the money. It is about the principle. She just wants to fight Rob and his family as hard as she can because they were so awful to her. They tried to destroy her life but she isn’t afraid of them and she isn’t going to let them win," a source recently dished to Radar.

"Blac is going ahead with her own show. She wants Rob to pay his fair share for Dream and she wants him to know he can’t f**k with her. That’s all," the source added.

We're really rooting for him!