Why is the American movie industries idea of love always to have the characters cheat?

I can already guess a romance movie just cause it's from Hollywood, the main character starts in a relationship, shows levels of unhappiness, runs into someone else, they cheat on their partner, they hide it for a while until the partner finds out, they go to the other person and that person turns out to be shit and they crawl right back to their previous partner when they realize they fucked up and its funny cause the person that gets cheated on in the movie spends the whole movie trying to get their cheating partner back, either that or they stay with the new partner and the whole movie is just a hidden secret to hide their unfaithfulness the whole movie 😂
Why is the American movie industries idea of love always to have the characters cheat?
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