Yesterday I found a solution that worked for me!
I have been trying logical approaches to this problem for quite some time. They didn't work. I thought to myself : "maybe an emotional solution would work for an emotional problem" ?
I poured compassion and kindness onto it. I said to myself: "isn't it wonderful that they have such a great bond of love and trust to be in each other's lives for 18 years? So few people get that in life!"
This worked! I immediately stopped caring about it and my obsession is at peace.