Very few TV dramas really ever convey the mess of real peoples' love lives but this certainly tries very hard and was worth watching.
I have to admit I originally only watched it because it was filmed in the "new town" of Telford, England - a bizarre mix of the old industrial towns that were the origins of our modern world and a newly built centre of advanced corporate blandness.
People who claim the story is ridiculous clearly don't read tabloid newspapers enough - our culture is full of older men having unplanned affairs with younger women. This is one of those stories and details the destruction that it causes.