Boyfriend help

My boyfriend unloaded some really heavy stuff onto me the other day. He’s been hearing voices telling him to kill himself, he’s been making himself throw up, and he absolutely hates himself. He said that he doesn’t tell people because they never understand and always try to help, which does nothing, so I’m desperately trying to just be there to listen to him, but I feel so useless. He goes to therapy but it doesn’t seem to help even a little bit. I want to tell him everyday why I love him, and why he means so much to me, but I don’t want him to think that telling me was a mistake, because I’m acting like everyone else. We can only see each other like a couple times a month because we live so far away, and we both wish that I could be there with him during this, but it’s too difficult. I’m scared that he’ll do something to himself, even though he promised he won’t, and he hasn’t texted me all day after I try to initiate conversation. I’m just worried and it’s starting to impact my own mental health, which I know is really bad, but I love him and don’t want to give up on him. I’m also really hormonal since I just got an IUD and it’s a couple days until my period so I’m just an emotional wreck right now. Any advice is greatly welcome.