SurvivingInfidelity.com^®

Hi everyone, I am posting here for the first time. A few months ago my world was completely shattered when I discovered that my partner of 8 years has been living a secret double life. While he had a history of being unfaithful to previous partners, his behaviours during our relationship had always been (as far as I am aware) contained to online messaging and porn use - until now.
What shattered everything was a massive, highly disturbing escalation that went far beyond anything he had ever done before. Over the course of more than a year,his validation seeking progressed into a deep emotional attachment between the pair of them, which then crossed into intense sexual messaging - sharing graphic fantasies and past experiences for his own gratification and to feed his dopamine addiction. This systematic grooming a much younger person than himself (legal age) known to both of us ultimately resulted in physical acting out, breaking through their digital fantasy into real world behaviour, with her being a willing participant in all of this. All this has lead us to separate while we each work on our recovery and therapy.
During my own specialised coursework, my therapist has talked about 'superficial compliance vs true recovery'. She notes that an addict who presents a flawless facade without emotional vulnerability or acknowledging their internal struggles, is likely just performing compliance. This describes my partner perfectly right now. He is trying to present himself as the "perfect recovering addict" while he relies on his secondary coping mechanism of alcohol to get him through stressful episodes.
He isn't sharing a single genuine struggle; he either pretends they don't exist or is completely avoiding them because he has hidden his true self behind a mask for 25 years. The reality is that the old addictive habits are still fully active. For example, his phone still goes everywhere with him, even to the toilet.
His emotional unavailability is fairly constant. He can appear warm, positive, and connected when I am not asking for anything. But the moment I need something, or try to have a difficult conversation about feelings (either his or mine) he immediately deflects, avoids or shuts down to escape accountability.
I would love to reach out to anyone who has dealt with a partner with CSBD/sex addiction - it doesn't matter if you are still with you spouse or you have chosen to leave. I want to hear from other partners about their experiences in early recovery and beyond.
How did your addicted spouse act during the early "sober but not recovered" phases?
Did this flawless, avoidant facade and lack of empathy eventually alter as they moved deeper into specialised group work?

Thank you for reading and for sharing your journey.