Infidelity is unforgiveable. JMHO. Marriage is a legal and spiritual contractual union before God and "Caesar".
That men occasionally do annoying stuff like whiskers in the bathroom sink, etc., we beg just a little indulgence.
LOL! I hope I haven't given the impression that I'm a mean person, as nothing could be further from the truth. I will be more than willing to give my future husband more than a little indulgence, and in return, I expect he will do the same for me. :-)
And potentially lethal this day in age. Think about the quality of person willing to bed down with a married person and think any manner of communicable disease. No condom can protect from many of these. The history of one you have sex with now becomes your own history. Today infidelity is much more dangerous than in years past and certainly not something God intended we live with.