That is terrible, Blueberry. Condolences.
I have tried to adjust my life, so I don't have those regrets. I think it's mostly working.
My DIL's dad was just diagnosed with stage 4 lung cancer. He doesn't have much longer and is in the palliative care unit at the Brigham. This is someone who probably has all of those regrets and it's an awful situation for everyone involved, including my son, who has to be the "adult" in this situation.