I was with my ex partner for eight years. No kids and not married. We split up 15 years ago. Looking back I'm glad we did as we are quite different people. I'm married, have three dc (relatively happy - not completely as I have two children with severe disabilities and the last few years have been very hard).
So...every now and again I dream about my ex. There's a slightly romantic undertone to my dreams. IRL I barely give him much thought aside from the very odd occasion of wondering what he's up to. We have no friends in common, our families don't keep in touch so why the hell do I keep dreaming about him?!