Will Sims brake up if they catch their partner cheating?

No, not without mods that will allow for them breakup autonomously. Sims can however autonomously ask your Sim to go steady from time to time, but not to break up without mods.

I miss the reaction like in Sims 2. They would lose it on the other sim and even the sim they cheated with, So funny. Sims 4 lacks the anonymous reactions. Even Sims 3 had them.

"OhMyHemsworth;c-16353660" wrote:
I miss the reaction like in Sims 2. They would lose it on the other sim and even the sim they cheated with, So funny. Sims 4 lacks the anonymous reactions. Even Sims 3 had them.

Sims 2 was along the opposite extreme, though. My legacy heir and his fiancee were in college, and the evil cow mascot flirted with him in front of her. So she was furious with him for days. Ever since then I locked out all NPCs when my sims went to college.

Sims 4 could use more emotions, true, but I like how the reaction is somewhat proportionate to what was done. Like there's a separate moodlet for a flirting spouse, compared to more serious acts of infidelity.

One sim girl I play with has the serial romantic aspiration, and one of the tasks is to have high romance with several sims at once. I sent her to the pool one time with her new guy and I hear crying in the distance and negative friendship and romance is going over her head. One of the other men in her life was there, I didn't notice him beforehand. This is the strongest reaction I've gotten.

The worst reaction I've ever had has been an angry moodlet from a sim's husband cheating on her (presumably with her sister from the date invitation I got later) at her cousin's wedding that wasn't even enough to shake her out of her happy mood. Mind you, that was probably just a bit of mild flirting as there wasn't much of a romance bar and whatever it was had already stopped by the time I saw the moodlet (I wasn't playing that household at the time because hey, cousin's wedding. I'm playing the cousin.)

I hate how they only get a moodlet, it would be much more realistic if they broke up with them, kicked them out, fought them, etc. I don't know, I just feel like there are zero consequences when it comes to cheating when there should be,

"Pamtastic72;c-16351801" wrote:
I've a question in a similar vein to the OP's. I've heard people here on the forums refer to having their sim in S4 confess an affair. Is this an option on the dialogue wheel, or just something that has to be imagined as happening? Because I've never seen it as an option.

no its not an option

The worst time extreme jealousy has befallen a couple was when I had a Sim and his rooommate Woohoo in the bedroom closet where his SO was sleeping! Even though the SO was sleeping, they knew what had transpired and was both very sad and very angry for a good two days, and when they woke up, preceded to autonomously slap the unfaithful boyfriend and it was a very tense and awkward household for that time. The boyfriend had to stay just friends with their roommate after that debacle lol.

I've tried "pushing the issue" to see what would happen and unfortunately I just get the usual angry moodlet and a small hit on the relationship bars. I do wish these reactions to wayward spouses and SOs would be tweaked better. I wish there were repercussions and consequences for these actions. The jealous trait is the only one that has any reaction in my game but they react to any social interaction so it can be bothersome in group settings.