Hello chocolate_cheezy,
My h was released from prison in August of this year, he was incarcerated because he was a risk to the public because of his dysregulated behaviours. He also has a criminal past and served prison time many years before I met him. He is diagnosed with Paranoid Schizophrenia combined with antisocial and borderline traits. This is a new diagnostic formulation arising out of his last period of crisis when he was assessed by a Forensic Psychologist because of his escalating risk behaviours.
His presentation is not nearly as sophisticated as your SO's sounds, even in public, he would be described as extremely low functioning now, but he is capable of manipulative behaviours that are need driven. He also has a vulnerability that engages others on a nurturing, maternal level, again this is needs led because he finds it very difficult to look after himself.
So I hear you and applaud your awareness of the need to implement boundaries to safeguard your emotional well-being. Boundaries for me are a crucial component of choosing to stay, without them my husbands dysregulated behaviours would have gotten worse and our marriage imploded.
It is worth saying that by adhering to your boundaries and stopping your h from being verbally abusive you might find that his behaviour in prison alters. I know when I implemented boundaries and started using the techniques to protect myself from my h's dysregulated outbursts he took his behaviour outside the house and started indiscriminately verbally abusing members of the public. In fact his behaviour escalated significantly, he was much more disordered and chaotic, hence his prison time. I realise now that there was an element of extinction bursts in this behaviour and that he had become so unwell he could no longer contain his dysregulations, they just all ran in to each other.
How long is your h in prison for? How does he fund his phone time?
Use the time he is in prison to rest and take some much needed time for you, that's what I did. I can hear you are exhausted but you are managing very well in your attempt to set boundaries. Starting now will help you get stronger and you can start to think about what changes you might want to make for you on his return home.
Here is a link I hope you find helpful,
https://bpdfamily.com/content/setting-boundaries