Tired of your Zois meddling with your plans every time you find them developing feelings or urges to pursue another NPC Zoi or (gasp) their BFF (how dare they!)? I have a trick just for you, but it’s not a complete fix. It has a caveat, a limitation if you will, but until they fix this dynamic of the game, this should do for now:
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Call the Zoi you want to get the Romance bar off.
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Opening the cheat console
CTRL + SHIFT + C, then inputshowZoiInfo trueand take note of the NPC’s Zoi ID. - 
Type the cheat
setRelationship [NPC Zoi ID Number] 0 Romancewithout the square brackets. If you have multiple NPCs to take care of, highlight the cheat, and pressCTRL + Cto copy the text. For the next NPC, repeat this step by pasting the cheat codeCTRL + Vand simply change the[NPC Zoi ID Number]. Open the Relationship Icon for your Zoi and you should see the Romance bar gone for that Zoi. - 
Once you’ve applied that to all of the NPCs, type in
CustomZoi [YOUR Zoi's ID Number]. This will open up the profile studio for your Zoi. - 
Near the
Genderfield, click the Edit button, and keep the Romantic Relationships on, but UNTICK theAttracted Tofield and clickComplete.
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Check your Zoi’s Info Card. The
Attracted Tofield should readNone. - 
Open the cheat console again and then type in
showZoiInfo falseto get rid of the Zoi IDs above their heads, then close the cheat console by pressingX. - 
Your Zoi’s Romance interaction will be very limited. If they interact with another Zoi that is not their partner, this is what’s going to be shown. Vice-versa, if an NPC or another flirts with your Zoi, they will act not interested, thus stopping them from making unnecessary flirtations when you are not looking.

Now here’s the caveat. If your Zoi interacts with their partner, they can no longer share physically romantic gestures such as hugging, kissing, trying for a baby and the like. They can still be romantic with each other, the closest to being physical is holding their hands while talking or showing them appreciation.
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I’ve tried this with lover Zois and married Zois. Another tip I can give is to have their Romance bar as high/get them married/have a baby together before deploying this trick.
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Simply reverse the steps above if you want to access the full Romance interactions again by going back to customizing your Zoi
(Step 4)& selecting a choice under your Zoi’sAttracted Tooption.NOTE:
@LazyTaco made a similar post, but it’s the reverse so that your Zois can start being all flirty. They have more detailed steps, so you may want to check that out too if you’re more of a visual person and needs more screenshots to follow the above steps. (Thanks for this, LazyTaco!
) 



