<human>: Can you succinctly summarize the text in 1-3 sentences?

Just to get it out of the way, I have bipolar, and I'm currently depressed and that's certainly coloring my thinking.

My 19 year old cat is dying. I don't think she'll last the week. Emotionally I'm a wreck because of this. She's honestly closer to me than most people and was a great comfort to me when I was first diagnosed with depression/bipolar and going through all those med adjustments. So I know it's normal to be sad that she's dying. But I feel worse than when my grandmother died. That woman taught me to read and helped raise me to become the man I am. I love her. But when she died I didn't feel that sad, and I don't know why. And when my uncle died, same deal. So now I just feel worse that I have a stronger emotional reaction to my cat than to not only a person but flesh-and-blood relatives. And that just makes me feel like shit, and I don't know how to fix it.
<bot>: I'm mourning more for my cat than my grandmother's passing and it's making me feel like a failure of a human being.