How can I help my friend when he doesn’t want help? Do I stop talking to him since he clearly doesn’t wanna talk?

So, my friend Steve insists that he is fine but always seems angry/talks in an annoyed or frustrated tone and it makes me sad. He doesn’t seem to care about anything and he says he cares about me but he’s so dry, usually depressed, and doesn’t wanna talk about it, insisting he’s fine and doesn’t talk to me at ALL. It’s really draining but I feel like a bad person. I wanna be there for him but I just feel like I’m bothering Steve.