The game gave my spouse roommate a random partner

I let my spouse in game live in my house as a roommate so I don't have to control them. But one day some random character hovered into my house and started kissing my partner... What? I can understand this is a feature in the roommate gameplay because I've seen it earlier but please don't make this happen so often (almost certainly happen) on married sims. Not specifically my partner. Is there any mod or something to prevent this from happening? I can accept completely removing this game feature.