I'm assuming people mentioned the word Narcissist in your last post. Because he is definitely displaying cluster b personality traits of some sort.
No empathy for a hurt partner - is not normal.
Gaslingting too, is not something a normal human does, it is the domain of the disordered.
They can also act as if nothing is going on when your world is crashing down. And often we can't understand how anyone could be like that, especially when they are our partner and supposed to care about us. Here's the thing - they don't care about us. It is that simple. They view YOU in the same way he views those Instagram images, only there for his needs: feelings irrelevant, needs irrelevant, marriage irrelevant (And how dare you, a 2d image, call him out on his behaviour or desires, HA! ) They do not ever admit mistakes and it'll be a cold day in hell before he apologises for hurting you.
His problem goes far deeper than a porn addiction. He is empty inside and all he will ever do, is take.
You mentioned his smile turns your stomach. I assume this is just part of the 'he doesn't seem phased' thing but, just incase, google 'narcissistic smirk'. I've seen a few of 'them' do that and it is stomach churning because it shows you exactly what they feel about you - contempt.
Please get away, fast. If your name isn't on the lease then go now, if it is then maybe you could phone the people on it to see f they would take you off it. You cannot take him at his word, he is a liar and he will likely get 3 months down the line and tell you he isn't moving. Start making plans to move yourself.