This is an intrusive question so please just ignore me if you think I'm being cheeky!
Really close friends of my husband and I have just broken up. They've been together for 12 years and seemed SO happy - one of those couples you just thought would make it. As far as we have been told no one cheated and it's mutual - they just don't want to be together any more.
Both my husband and I are terribly upset, both because we love and feel sorry for our friends and because it's alarming that even very established couples who have been together for ages can still decide that they don't want to carry on together.
I'm hoping for some insight... what causes couples to break up after years of building a life together? What were the warning signs and what was the final straw? Could you have averted it?