My boyfriend is suicidal and almost every day says that he is going to take his life and he doesn’t care about anything anymore. He has never said this to my face but every time he goes through this I get a text from his sister asking me if I have seen him or heard from him. There’s times when I get a text from his sister and him and I are in the same room. To me he looks fine, he’s talking and smiling to me. But there are times when he goes missing and he says how much he hates life and he’s going to kill him self. Again he has never said this to my face so I don’t know how to help him I don’t know what to say.  When I try to confront him at the moment he never answers me and I worry something happened to him, there’s times he even blocks my calls. When he comes back we have a conversation about coping mechanisms but it just never happens. I am running out of options here I don’t know what else to do. I would like to hear some advice from you guys to see what you think. 
Thanks