I mean we know why JJ is mad? The way he's been treated throughout the relationship, he's exhausted and tired and he's trying his best to separate himself from Leo but can't. And just because JJ doesn't show it on his face doesn't mean he didn't feel anything when Leo was crying. We literally know that he did feel emotions because of the end we see his thoughts, that every single time, he gives into Leo (we can infer he gives into him because of his emotions).
Idk why but seeing him finally fcking express emotion fulfilled a desire in me that I didn’t even know needed to be satisfied
Is not like Leo is cheating on him. Also, can they just talk and communicate like some fucking adult? Idk, but Leo bawling his eyes out and J don't even feel anything about it really irk me