Unicorn ?

So i have been going to a lot of therapy for past trauma and abuse.

One thing i regularly have been finding myself saying is that i need a closed polycule because open polycules in my experience have lead to cheating and emotional abuse. And this has recently gotton me thinking, and im starting to realise i might due to abuse have unintentionally become the unicorn that couples seeking to form a triad look for, and that due to all the horror stories i have heard scares me.

Can someone please tell me good stories about situations like i am in to give me hope for the future