What your DH is doing is classic. He is having an affair or EA and the way his brain deals with it is to convince himself that it is your fault, or he has no choice in the matter. This is because the other alternative is that he is a selfish c*nt and who wants to think that about themselves. If he thinks that, then he has to stop what he is doing. So, whilst this feels personal, it isn't. He is brainwashing himself into believing that he doesn't love you, you are covered in baby poop, he will be better off somewhere else, etc. Whilst men are in this zone they also do other dangerous stuff like hiding money away and screw you over big time to maximise their walk-away bundle and minimise what you have.
My DH has done this to me twice. Once 17 years ago when I knew no different and about 2 years ago. On both occasions, what saved my marriage was my reaction to it. The first time, pre-DC I was heartbroken but didn't show him that. Over 6 weeks I got a new job in another country, made new friends, got fit and healthy. When it came to the conversation about when are you moving out, I am moving to Australia and need my deposit, he sh1t himself. The second time it happened, more recently, I again took the opposite to the pick me dance and told him, great, this is how much money you owe me, we are moving to this place so I can walk to work and school, I am looking forward to my new life and I can't wait to meet some new men and make up for lost time. Again, cue brown trousers.
My DH is still here, but that is on my terms. My DC will be fully grown soon and they will be independent and earning their own money. Until then, he can work 60 hours a week financing it all. That sounds really bad, but I loved my DH so, so much and he broke my heart twice. Now I am wiser, have my own account which I pay into every month, have copies of EVERYTHING and I know my rights.
Your DH will either leave you for someone else or come to his senses. Either way, you need to have copies of everything and all your ducks in order. If he drops the bombshell, tell him "fine, let me help you pack", don't plead or beg. I guarantee your reaction of whatever will confuse the hell out of him and possibly jolt him out of it, that is if you want him back after he has dipped his wick elsewhere.