I'm sorry to say it but I'd prepare yourself for a break-up now as it sounds like he's done with you.
My ex did this with me. He stopped having sex with me or being intimate in any way to begin with, always citing work stresses/fatigue as a reason. Then he couldn't even stand to hold my hand, actually recoiling from me in public once when I went to hold his hand in the supermarket, saying he felt it was "unnecessary" to advertise to the whole world that we were in a relationship (we'd been together over 3 years!!)
Then I noticed that post stopped arriving for him at home one day. I casually mentioned it and he waved it off as him having had a lot of his stuff moved to paperless billing to help save the environment. Fair enough, I thought.
He was constantly sulking, constantly in a strop. Whenever I asked what was wrong or if something had upset him, he ripped my head off and told me there was nothing wrong with him and that I'd imagined it.
Anyway, I came home from work one day unexpectedly early as my last appointment had cancelled only to find him halfway out the door with his bags packed.
Turned out the bastard had bought a house (yes, a house!) behind my back, had been slowly removing items from the house when I was at work such as bits and bobs from the shed/attic so that I wouldn't necessarily notice they were gone, he'd redirected his mail, and had been planning his exit for months, all the while gaslighting me into believing that I'd imagined all the glaringly obvious issues that kept presenting themselves.
I honestly think that if I hadn't come home when I did, he'd have just gone without a word. To this day, I have never had an explanation from him as to why he left. He just told me it "wasn't working" for him anymore. Fucking coward.
Brace yourself, OP. Things might get a bit rocky as it seems to me the warning signs are all there. Sending you hugs.