Life is full of 'what ifs', and I am always cautious of 'what if' days, because, if you had done something different or whatever, you do not know how that different action/outcome would have reshaped and changed your life in the longer term.
Someone who died quickly in an accident, might live on to die after a long and painful illness. Before I married DH I had two relationships that could have ended in marriage. Each had its 'what if' moment. Both men are now dead, but I know how their lives turned out, one was diagnosed with a degenerative disease in his early 40s and had to give up his profession and retire before he was 50 as bit by bit the illness took its toll. The other chose a career that took him and his family around the world to different countries before he finally settled in Australia. having had a peripatetic childhood in a similar family. In adult life I wanted a more settled existence.
Being brutally honest, marriage to my very DH, and the life it has given me has given me so many more opportunities and so much more one I could shape for myself.
So I stick to wanting to relive days when I was ecstatically happy and have chosen one where what has followed, is what I hoped for.