OP, not only does your husband know full well that what he's going is worse than looking at porn, he also knows that most people would consider it cheating. He's saying what he's saying to minimise what he's done. HE KNOWS.
You won't entertain the idea of leaving, that's your choice of course, but have you considered that he knows you won't leave and that's why he treats you with such contempt? It's because he can and he'll continue to do so.
He is financially abusive, telling you you need to cut back on spending, whilst all the time he's spending money (and time) on this. He keeps you in ignorance of your true financial situation and, judging by your astonishingly low self esteem (as demonstrated in your posts), I would not be at all surprised if he's emotionally abusive too.
What does he do that makes you happy?
None of this is about you and how you look, it has everything to do with the fact that he's a misogynistic bastard. If you can live with that, your choice, but I don't think you can, you already seem to think very little of yourself. Where do you think your self esteem will be in 10 years time?
I know you don't want to think about divorce or the future, you've had a shock. My advice to you would be to send him away for a while, absorb what you've found out, then seek legal advice. You don't have to act on the legal advice, but it does no harm to see what you're entitled to. I suspect you'd be financially better off out of this relationship, you'd certainly be better off emotionally.