Am i the only one that feels when my s/o and I have bad days they can be bad?

I just feel like a shitty person because i ask him if he's okay, more than i should sometimes. And today he kinda snapped at me... I care more about his happiness then my own but i don't think the feelings are the same.

For example, i wrote him a letter 5 days ago explain how i felt. He has been putting off reading it to hang out with his dad. my feelings go ignored. And if i address it when him I get "Jesus Christ" "here we ago with this dumb Shit"