One of my cousins married his wife, they got divorced after about 15 years, got married again a few years later, and divorced a few years after that.
Neither one has remarried. Honestly, I think they love each other as much as two people can, but they just can't live with each other. I think that's why they haven't remarried other people, because they will always be in love with each other.
I know it may sound crazy, if you love someone that much you would want to be with them all the time. But it just didn't seem to work with these two.