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Sims will become jealous if their "partner" is unfaithful, even if the partner does not view the jealous Sim romantically. It is noteworthy that a Sim can hold romantic feelings for another Sim without those feelings being reciprocated. Jealous Sims will become furious at their partner if they observe cheating, and will become furious at the Sim that their partner was cheating with. This game feature existed in The Sims and The Sims 2 base game, but was expanded on in The Sims 2: Nightlife with the introduction of the fury system. Additionally, a jealous Sim will also become angry with the Sim that the partner was romantically engaged with, and the relationship between the jealous Sim and the other Sim is also harmed. When this happens, the jealous Sim becomes angry with the partner, often to the point of fighting, and the jealous Sim's relationship with the partner is severely harmed. Jealousy occurs when a Sim who has romantic feelings for another Sim observes their partner engaging in unfaithful behavior. UPDATE 2/24/20: Fixed some issues with the no jealousy trait.Jealousy is a gameplay feature in The Sims series. It is only available between sims who are committed (steady, engaged, married), and goes away again once both sims have either the no jealousy trait or an ACR token with jealousy set to none. It might take multiple tries for them to get through the conversation without disagreeing, but once they have both sims will get the no jealousy trait and/or changing their ACR token jealousy stat to ‘no jealousy’ depending on if the sims have ACR tokens/if you’ve downloaded the trait.
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It looks a little goofy, because sims, but oh well.
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I essentially see this as a simpler alternative to the ACR jealousy system.
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