A man whose wife has just announced that their marriage is over, that she is leaving..................His life as he sees it is over - pointless
Actually they had been separated for some time but shared the house along with some children. It's not like this was a bombshell.
There is also nothing to say that the wife and adult children hadn't simply gone to visit relatives.
They have at least one grandchild so presumably not all the children were staying at home anyway.