Update: I found out why my boyfriend's acting this way, IDK what to do

Okay, so I found out that my boyfriend went from loving to indecisive and seemingly distant. I feel bad, though, because it turns out that while he says he wants me and he can handle a relationship, he's actually badly depressed to the point where he can't do much and can't talk to me much. He is always doing bad and extremely upset and low.

He says he can't say why he's upset, but that's okay