TW: suicidal ideation, drug abuse, infidelity. 
My partner with bpd has been in a downward spiral for days now. I don't know what to do. He keeps threatening suicide and feels worthless and embarrassed by his behaviors caused by his splitting. I try to reassure him but he just wants to leave me and everyone he knows behind and "start over" so he cab "try to be good." Even though no one thinks of him as bad. The one friend I was confiding in emotionally about it knows of his mental health struggles but he thinks she hates him now. He's just been traveling down this deep dark hole and I don't know how to pull him out this time. He keeps saying he's planning on buying a gun, planning to cheat on me, planning to get heroin and relapse after 4 years sober. I'm really afraid of his self sabotage right now and need to know what I can do to help him.