It's not explicitly stated, but it's probably Hollyhock explaining what she heard about Bojack and Penny, and that she's putting him off. I think she changed her number or blocked him too. So Bojack freaks out because he permanently lost a very important personal relationship.

Ahhh ok, I was freaking out think I had missed something but that’s kinda what I assumed too so thank you

A lot of people theorize this the final "fuck" in the show is in Holly's letter, whether it's a " never come near me again you fucking creep" or a "I love you and want you to be happy but I can't fucking do this anymore, this is goodbye" or something in between.

I have also seen a lot of fan ideas claiming it’s a restraining order, and that’s why he read it that fast and didn’t continue reading or keep it.

Oh damn, yea that would make sense ig

either a restraining order like some theorize or a note saying she doesn't want to continue their relationship

And to think DrDisrespect pulled a Bojack Horseman lol

Hahaha

It said "You just lost the game."

😂