Boyfriend wont stop threatening suicide

I am going to seek help for him, I know that. I have before. I dont see how this would legally bind me to anything to do with it though? I've seeked help for him multiple times, and will continue to. I'm just looking for advice from people who may know better then myself. I am contacting his mother tomorrow, and depending on her reaction I will go from there. If she chooses to help, I can see what she recommends. If she doesn't, then I'll be forced to call the in-home therapist. Beyond that I have to worry about myself and my future as well. I have been trying to help him for 4 years (when I found out he dealt with depression and suicidal thoughts). I've been trying to get help from his family for 3 years as well. I feel like they don't believe me at this point because he denied it each time, but its all I can do other then the in-home therapist.

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