I no longer automatically trigger when I see infidelity portrayed, but it does bother me when it's made to seem sexy, fun, harmless, or the fault of the betrayed spouse. I tested myself by watching this movie.
It was not especially well made, but it was actually a pretty powerful cautionary tale. It started out at the MC, with a woman wanting to leave her M for another man. The MC tells a story. Goes through the slippery slope, etc, and how this woman's A ended up destroying her life. Big time.
I actually appreciate this kind of portrayal of infidelity. In reality most people regret their As and they have catastrophic consequences. Lives are destroyed, children are permanently harmed.
That is a message that should be out there.