I can't tell anyone [vent]

Whenever my boyfriend says he wants to end himself, I always get super worried. But I feel like I can't tell anyone about it, especially my parents because I don't know what my boyfriend will think and if my actions will make it worse, and what my parents will think of him if I tell them that he told me he wanted to do that..They already seem to have some bad thoughts about him already. I love him a lot and I just want him to be ok, I try to comfort him and make him feel better as best I can but I just don't know what to do. My anxiety is already pretty bad and this makes it worse, but I guess it makes sense that it should.
The fact that I don't think I can tell anybody about it is eating me up inside a bit. Yesterday I was worried about it when he mentioned it and my mom noticed my anxiety. I told her a reason that was close enough as I could get I suppose, but I couldn't mention the true reason I was anxious. I keep saying to myself in my head that if he keeps saying he wants to do that I'm gonna tell my parents, but I'm still very hesitant to do so. Even then there's not much that we could do since he lives in another country.