I didn't say that any relationship was less valid than any other. I am not talking about what marriage means, but addressing a previous point about what it says.
A sham marriage is telling a lie, but it is still saying something (although that thing is untrue).
No marriage says nothing.
Presumably for couples who both choose never to marry, they feel that the constitution of their family is a private matter, OR they want to cohabit but not be a family. Those are perfectly valid choices and I know plenty of people who are happy that way.
But being together for a long time says nothing to the world about your happiness or your desire to be a family. And neither does having children (particularly if they are conceived by mistake).
The only thing that tells the world that you are a family is either a marriage, or a convoluted legal arrangement and a public declaration of some kind.
In a couple where one person wants to make an explicit, public commitment to being a family, and the other wants to keep their relationship an entirely private matter, it is a bit silly to claim that those two positions are the same. They are not.
The OP has no public commitment, and no legal security. She has only the private assurances of a man who is unwilling to marry her with no explanation for why not.
If you don't care about how it looks to the outside world, then stop banging on about marriage. That's all marriage is - making your commitment a matter of public record.