I would agree with your OP.
I had explicit conversations about future aspirations including marriage and DC with my EXDP when we met in our mid 30’s.
Due to our ages, we agreed to try for DC first (this was so silly of me!) and I was pregnant the first month of trying. DC2 arrived 13 months after DC1.
After the DC arrived and we’d settled into our routines, I mentioned marriage once or twice a year and he always said leave it to him, and he didn’t want a big wedding, but no proposal ever came.
Covid hit, and I thought he’d be pleased that we could now have a small wedding, however he made more excuses, and also became emotionally abusive, lazy, resentful and full of contempt for me.
I left him after 8 years together as it was clear he’d continue in the same behaviour vein, and that he had been stringing me along the whole time and future faking me.
I do believe that if a man wants to marry a woman he knows wants to marry him, he will get on with it to make sure nobody else snaps her up!