His addiction is himself, his wants, needs and ego, probably has been through his entire marriage.
He will never admit wrongdoing as this would change the dynamic in his marriage if he were to remain, he knows this. It is imperitive that he sticks to his narrative and op, if waiting for remorse or mercy is going to be waiting a long time.
The thing is op, he has taken you for granted, his lengthy marriage, the cozy homes that devoted wives create, are usually built on many compromises and an unswerving love that he has not yet felt the loss of.
At the moment he may feel he can do without this devotion and loyalty from you but as the weeks and months slip by your love will become a distant memory for him, he will feel neglected and that may provoke him into anger.
Cake eaters want it all, the reputation, the everlasting love and the fun away from home that makes them feel alive.
There really arn't any winners with men like these, emotions and loyalty are not paid back in kind, feelings are minimised as irrelevant and unimportant, and many equate love with how much you can swallow and forgive.
Look at him as a whole, not as your husband or the father of your children, think of him, his morals, his views, his nature, because sometimes there is just no getting through to them. Trying to understand, minimise or excuse his motives is pointless, he's doing it because it's pure joy at the moment, that hurts I know but he can do this by having zero empathy, this is him, a man with no concience.
His consequences are happening right now, they are being enforced by you, he no longer has cozy rooms and respect, he is falling off the pedestal and your looks into his eyes will reveal all, your disgust must be palpable, still he digs his heels in, very soon he will be the talk of the town as gossip speads about him being a creep.
He's created, chaos, unstability and hate in your home, he is refusing to accept this, even if he came to his senses he would blame you for not allowing him the freedom to live and love, he really is stupid and self absorbed, I guarantee this will backfire on him eventually. He will try to shame and humiliate you into silence, take no responsibility, this is him, do not quiet yourself for him.
Within one year he has demolished what you have built over many years, he's going to have to catch up with that information and I've a feeling you are capable of ensuring he understands this.
I bet he's never had you pull the love from him before, he's got a real treat coming.