My ex husband said exactly the same as yours in the early days when we talked about what we wanted for the future.
Throughout the years together he had continued to tell me his hearts greatest desire was to marry me but 'life' kept getting in the way.
Eventually I think he felt that if he didn't propose I would leave so he did. I had never expressed an ultimatum but internally was beginning to think about whether what he was saying was true compared to his actions.
He had various excuses as to why he was acting like such a twat in the wedding planning phase. I tried to postpone twice and even attempted to call it off once and each time he sobbed and pleaded with me till I agreed to forge ahead.
I think a big part of me was hoping that after the ceremony things would go back to how they had been before - which with hindsight and therapy wasn't actually good at all anyway! I felt that chasm of knowledge sucking at me though, in my deepest of hearts I knew my fears that it was all smoke and mirrors were true but even then I was convinced that it was just some sort of cold feet on his part and he would be fine again soon.
I never shook the feeling that I had forced him into it which he knew was a massive fear of mine.
On our honeymoon, which he didn't want to have, he told people we met and the people who's cottage we rented that were just there on our holidays.
It got progressively worse when we got home and when he wasn't subtly sabotaging me he wasn't giving me the silent treatment.
We tried counselling where he played the confused but loving husband, he just didn't know why he had acted as he had etc etc. I became very depressed, we argued all the time and he was a passive aggressive shit. It was death by a thousand cuts for years before we got married and I hadn't properly realised but it really escalated after the marriage and I just couldn't not see it anymore.
Shortly before we divorced he confessed that when we were dating he had told me what I wanted to hear because he wanted to be with me and didn't really care how he went about it. He never wanted to marry me but that once we were together he didn't see any reason to come clean about his real feelings because basically he didn't care about mine.
Looking back I'm sure if someone he liked better had come along he wouldn't have had a problem jumping ship faster than I could blink and in fact his girlfriend after me was an old friend he had mention-itus over and had started to spend time with every now and then - how cliche.
Don't be me @Spinstermum take your agency back, he's already told you what he wants to do by doing nothing. Stop waiting for him to change his mind or be less of a coward and tell you the truth is that he doesn't want to get married.
What do you want to do?