He is rarely happy or motivated anymore, he is sad most of the time. Thankfully he hadn't expressed suicidal thoughts (at least not to me).
We are not dating for very long, and I won't lie that it scares me. I was medium degree depressed until last year and I know it can be terrible. I'm scared that he'll take me down with him. He tries to get better and searched for a therapist but now he can't seem to get to it. I don't know how to address it.
I want to help him but I don't know how, when he's depressed he doesn't want to talk to me. 
I don't know what to do.