Over the years I've had friends and family that have been separated or divorced, and I've typically not been surprised. All were the obvious reasons like asshole/abusive/lazy DH, affairs, alcohol, etc. Typically the writing was on the wall, and I was never surprised when it finally happened. In fact, I was in one such situation! Nobody was at all surprised.
Over the last months, I've been totally shocked by one of my best friends divorce, and now by DSis separation. These just seem out of the blue, no forewarning, I'd consider them great couples with so much going for them (both in early 50s). Really makes me sad thinking about it.
AIBU, to ask if you've ever been totally surprised? It's new for me :(