<human>: Dealing with boyfriend has been harder and harder everyday. I feel like I should watch everything I say and everything I do because he becomes so sensitive. Today we were talking about his mother and and my uncle, who also has cancer. I told him, "Look on the bright side, your mother has seen you grow up, if my uncle dies, my little cousins will never know what it's like to have a dad" and he got very mad at me. He said I should stop comparing. He just walked away.

I know it's my fault that I compared. But I honestly just wanted him to see the brighter side of things. That life is beautiful. And he should see the good things about it rather than dwell on the sad parts. 

Am I wrong? Please tell me because I feel stupid about this.

Can you condense the text into three sentences or less?
<bot>: My boyfriend's mother has cancer, and I don't know how to give him advice or cheer him up. It feels like everything I say is wrong.. Help?