Drop them into Documents > Electronic Arts > The Sims 4 > Mods .

It allows Sims to develop reputations as "thugs" or "bullies," creating a power imbalance in a household that the base game cannot replicate. 2. Life’s Drama Mod (by Sacrificial)

Perhaps the most famous mod in this category, Sacrificial's mod allows for physical altercations that go far beyond a simple "Slap" interaction.

Using mods to simulate abusive relationships can be a way to process trauma or tell complex stories, but it can also be triggering. Many of these mods come with "toggle" settings, allowing you to turn off autonomous violence or specific interactions if they become too intense. Why These Mods Peaked in 2021

All of the mods mentioned above were—and still are—available for free. To add them to your game:

If you want the psychological aspect of a toxic relationship rather than just physical conflict, is the better fit.