I do understand in a way where Genial Harry is coming from but, frankly, living in an unhappy, loveless marriage must be intolerable. Nowadays divorce is more civilised than it used to be too, both mother and father support the children and share them - until they are teens and want to do their own thing. Doesn't apply to everyone of course, e.g. if one partner abandons the family or is abusive, but most share custody. In old days children belonged to their father!
Trying to imagine being in a depressing relationship where there is virtually no joy is too awful. I have always loved my husband - we lived together for over a year before marrying - and he loves me but nothing special about us, just how it is. We're fortunate. I would not have stayed if I'd been miserable. Might have tried to make it work for a while but there are limits. I'm glad times have changed and there is less, if not no, stigma to divorce any more.