Cheating has first become the norm in the society these days. It seems not to be a big deal to be in love relationship/marriage and cheating on your partners. Another challenge nowadays is people don't have boundaries or don't know when they are crossing the boundaries.
In regards to crossing good boundaries or not respecting good boundaries, I think it's part of lawlessness we experience in societies. There are natural boundaries that ought to be respected but those in satanic bondage can't respect them or dont even know how to respect them.
If you are automatically charging people for crossing boundaries, they will likely be more careful.
There are times boundaries can be crossed though. When it's absolutely necessary and you have to still be keeping the activities generated from this immutable, having honest witnesses, keeping records etc, just incase you are needed to defend your boundarry crossing actions. You have to be qualified to cross this kind of boundary and you must doing in peace/love and without generating problems (perhaps the problem generated should be negligible). This doesn't apply to things forbidden by our CREATOR like committing adultery. You can't justify adultery because you commit it in love.
In regards to infidelity in marriage, "mere" lusting in your heart ater those who aren't your partners qualifies you as an infidel. So we need to be totally loyal to our spouse.