negative nelly

My boyfriend is so completely overstressed at work and I'm the only one he talks to about it. He constantly will say 'it's killing him' or 'i want to kill myself' (which strikes home to me because 3 of my friends have committed suicide) it's too much responsibility for him. This stress will be over in a few weeks... (going on for about 8 months) I wish there was something more i could do for him then just being there. It's gotten to the point where i'm afraid to ask him how he's doing because i know it will lead into an hour+ about how much work sucks. I've tried to be supportive and he doesnt want to see a therapist or doctor. I feel at a loss and helpless. I can't help but feel guilty that I yearn for his attention and affection like how it use to be.... I know i need to just be patient and listen to him, it's just become a lot on my shoulders as well.