While we hope that love will last for ever and marriage is permanent, the sad truth is that relationships break down and divorce happens.
Having been thru a tough divorce (long and a little nasty) I understand how your confidence can be knocked. I discuss some strategies for getting over this.
I also mention my amazon book that I wrote about how divorce can affect us men :)
https://www.amazon.com/Divorce-suffer-heartbreak-discovery-rebirth-ebook/dp/B019M5H20O