Relationship Advice needed

My boyfriend for well over a year now is very lets just say unhappy with life and he says without me he doesn't see anything else good in life or worth living. But these past few months our relationship has changed. He always keeps asking me what I'm doing and who I'm with every second of the day and we never make conversation. I'll ask him how he is and just conversation but he never cares or tries to continue. He will beg and beg for decades, never force, but just constantly wanting it. He just doesn't care if I'm happy or not and I'm not happy in the realationship anymore but I'm scared to leave Bc of things he may do to himself.