I have a child with my OH and we aren't married. Does that mean he's waiting for someone else to come along and will leave at the earliest opportunity?!
Not that he would leave at the earliest opportunity but that he isn't as committed to you as you want him to be - which was my whole point - and there is a real risk that he will just walk out at some point in future to be with some he actually does want to marry if he meets someone who ticks his boxes.
A child is a least equal to but really more of a commitment than a marriage - but it's easier to walk away from a unmarried woman and child than it is to walk away from a marriage, a public and legal commitment and a joint financial life plus a child. So if a woman actually wants marriage (prior to having a child) it reallly makes no sense for a man (if he wants a secure commited family life) to not want to get engaged or get married.
Look at what you wrote earlier:
I'm 30, we've been together nearly 6 years, lived together 5 years, mortgage is in my name only and we have 1 child and were not engaged. I'd love to get engaged at some point, but for now I am happy as we are until he asks.
You are saying "you'd love to get engaged" but 6 years later and a child, it's a bit late to be saying that. What you have got is a man who by his clear behaviour has indicated he doesn't want to marry you or commit to a life together of financial ties - you don't even have a joint mortgage together. It's ridiculous situation to have put yourself in if you want to get married. Your posts to OP on this thread are very self justifying. If you want to kid yourself you are happy with your situation, you carry on but it is silly for a woman in OP's situation to explore having a child with this man.
I understand that for some women marriage doesn't matter - but that is not the OPs situation (And if you'd love to be engaged it doesn't sound like it's yours either).