I think that there is an extra problem when our spouse take up again with someome who was a childhood sweetheart. Not only are they coping with all the emotins surrounding infatuation but they are also being taken back to a time when they were younger and had their whole life in front of them and where anything could still happen.
It makes them feel young and vibrant again and the old GF/BF sees them as they were rather than as they are now. Personally I think sites like friends reunited have a lot to answer for. Some people just seem to have a hard time growing up gracefully and embracing the next stages of life. They can only do this for so long and then they become a public laughing stock in addition to having thrown so much that was important away!!
Saffie me 46 H 46 M in 1986 D20,D18,S16,D13 H's A 01/05 to 07/06 H recommitted to M 07/06 renewed vows 09/06 Going from strength to strength