I think that's evidence that Harry wanted to be top dog.. not necessarily king but the most popular royal.. and I think that yes, when Will started to have kids, Harry became aware that in a few more years, those children would indeed steal his spotlight, and he'd become the second banana, the older middle aged Harry who was no long the most popular...so probalby all this has been brewing for a few years, the feeling that he doesn't want to be second, third fourth best.. and when Meg came along, he saw the opportunity to get out and have a different life, where he or he and Meg can be top dogs...