I don't know what to do about my boyfriend

I feel the energy draining from my life with his attitude since his "suicide attempt". He was bad before but since then he's worse like I got a headache from his negative selfish attitude and swore at his playstation. Then at the shop he told me I annoyed him because I didn't want to choose which yogurt he should buy then I just went off saying "it seems like all I am is a frustration to you". Since then hes been a bit nicer and gave me a cuddle and is saying thank you when he saw I did his laundry and baked his potatoes. Normally he doesn't say thank you. He's 44 and I often feel like I'm dealing with a child's attitude. I'm 31.