Old man rebirth to atone for his regrets

Hello, I am an old man who died of cancer. but I still have regrets towards myself The regret is never expressing my love to my single teacher when I was in high school but 2 years earlier she married another man Well, the man is well-established and rich, so I regret not expressing it to the teacher I like. and after her told me her gave me, her wedding invitation letter but as a man I have to come and let her go to be happy with the man she chooses I arrived at the wedding venue and he waved at everyone who came with a happy smile and I congratulated the man and said make her happy bro she might be a good wife for you and congratulations on your marriage the man said thank you to me and he said yes i will make my wife happy and then i left their wedding venue 3 years passed and I saw my teacher who invited me to his wedding with his son. and I greeted him old man: hello teacher how are you? ma'am teacher:oh hi Lorenn, I'm fine, how are you? lorenn:yeah me too but where is your husband ma'am teacher ma'am teacher:Oh sorry, I'm divorced and I only live with my child Why did the teacher divorce her husband?