Now that you mention it, you’re completely right! Just a theory, but I think the only reason authors do it is to add drama. Maybe the scene isn’t as spicy as they want it to be, so they just add a cheater in since everybody hates them. I also think that maybe they don’t want you to like the ex so that you’re more driven to the chosen LI, instead of saying “I like the ex as a character, I wanna be with them.” It isn’t realistic that every relationship is going to end bad and I’d actually really love to see relationships end in a way that isn’t absolutely horrible.
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