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Coralmist I have talked with my wife about this as she wants me to be happy as well. I keep telling her to focus on herself, she has the terminal illness after all. I ask every now and then if my depression is getting in the way of taking care of her the best way I can. She always tells me that I am doing much more for her than she could ever wish. I see that as I am doing all I can for her and my issues are not getting in the way. For me, I feel kind of useless if I am not doing something for someone else to make their lives better. I go out of my way to make others happy at my own expense some times.
First thing that came to my mind when I read what you wrote was...I can relate with how you feel if things get too good in life, and then I thought about how I could do or say something that could make you feel a little better about yourself.
I think I am just hardwired this way.