I'm so glad at a time when more than half of children are born outside of a family that the show would suggest getting divorced because someone that was believed dead just happens to reappear when everything else is ok. And I expect to find the guy that happen to find Grace is somehow heading a deep secret beyond wanting to take the guy's wife.
Do people get divorced, engage and not get married, etc; yes. But presenting relationships as they do simply isn't for me. I do find it interesting that the same-sex couple all is good. They should be as unhappy in marriage as traditional marriages. After all, misery loves company.