OP, I'm quite horrified by this. I like to try and work out motives for odd and unkind behaviour and usually people like this are motivated by self benefit. So what is his possible self benefit here?
It would my guess that he wants to do something, or continue to do something, that isn't normally consistent with marriage, and is softening up your boundaries to enable it or seeing whether you will put up with it. He is probably aware that such a divorce after such a short marriage will normally result in a clean break, with neither party owing the other anything, although you could make a bit of a fight if you can pay a lawyer for a small beneficial share of his house to be paid in a cash lump sum.
I have an ex who behaved in a way that might shed some light on his motives. I was in a ldr with him and I thought we were doing great, then out of the blue he ended it abruptly and cruelly. He completely cut me off, blocked me on his phone and on messaging services (although I wasn't really messaging him much) and refused to see or speak to me after his announcement (which came by phone).
Then out of the blue a year later he sent me a text message apologising for the way he had behaved, reminiscing on how good we had been together and how much he missed our relationship and saying how he just hadn't been able to talk to me about it at the time.
Like your DH, he had always been a bit snooty about womens' appearance and age, and I was 3 years older than him and always worried that he would meet someone younger when I wasn't there. He was particularly cutting about what he described as "old women" - anyone in their late fifties or older by his definition. He really was derisory about them - he worked as a dance teacher and he used to describe in quite scathing terms how they would join up after their divorce in an attempt to meet new men. I won't go on. You get my drift. I know I should have pulled him up on it. I was shocked at the time as his comments were out of keeping with what I was being fed by him.
Unknown to him, a mutual friend had by chance found out that he had got married. He kept it very secret, if she hadn't found out I would have assumed he was single. We (mutual friend and I) then turned into detectives due to curiosity and found out (from public registers, Scotland) that he had married a woman of nearly 60 (he's 41) and due to some further mutual friend FB stalking we found out that she was a very plump woman who had once been a bride from a third world country (for her first marriage). This is going to come across wrongly on mumsnet but she wouldn't be a woman who you would normally expect to marry a very handsome 41 year old with his own mortgage-free flat or to have that many options in life at all. Yada yada she has a sparking personality - she looked absolutely furious in the FB photos of their tiny wedding in a community hall.
Also found out that he had cheated on me with at least 2 other women, and I only know about them because I vaguely know them and we have mutual friends.
For balance, I'm a fitness model and we met through competing in the same sport.
Anyway, I think he has deliberately married a woman who will tolerate his cheating (and probably because she is from a third world country, will run around after him like a second mother) and if not, will divorce him and he will be none the worse off. He's behaved himself up to the wedding to get you signed up and now he's positioned you, he is testing where your boundaries lie. I really think this man shows all the signs of being a manipulative liar (he could have a mh condition but anyway lets go with being a liar) and I really think you need to get out now and keep away from him. My ex's secret wife has a property with no mortgage worth about 250k, you have your coming inheritance. Neither have fully evolved yet. Just get out, do not allow this man to erode your boundaries. It is a huge shock when you realise the man you are with is not at all what he pretended to be with you, but no-one normal says what he said to you to the woman they have just married. He has shown you who he really is.
I wondered whether he had shown you any signs of this before, or had he been particularly careful to show you how "decent" a guy he was? The more I found out about my ex, the more I could see character traits in common with men like the Tinder Swindler. This sort of thing seems to be happening more and more, I do not know what is wrong with men now.
I hope you don't think I'm projecting enough, but there is clearly a motive for his behaviour.