Do i continue to love or let go?

Continue to love....my sister was married to a man 23 years older than she for many years. Yes, he died of natural causes a few years ago.....but they were happy together for a long time before he died. Some people have died when they were more than 20 years younger than he was (he was 82).
If you really love someone you shouldn’t lose them now because you fear losing them a short time from now. I’m here today because my grandfather didn’t do that. My grandmother was diagnosed with rheumatic heart disease when she was 18 (her parents and siblings all had it, and none of them lived past age 35). She was told she had a year to live. A short time later she met my grandfather, who fell madly in love with her and proposed to her after they had dated for 3 weeks. She told him that the doctors had given her a year to live. He said “Well, however long you have to live, that’s how long I want to live with you.” They were married for over 50 years and had 3 children, including my mother.
(My grandmother’s rheumatic heart disease was not as severe as the doctors back then had thought, and none of her children or grandchildren has been diagnosed with it).
You never know what the future might bring....don’t let go because of that.