To feel protective of my house

Getting married puts your house at risk, I just wouldn’t marry. How does he earn well but owns no property? Is his wage/employment on the books or cash in hand/under the radar….if so, you’re being set up to fail here.

‘He doesn’t have any property….’ I would seek legal advice re this and protect your children and yourself.

I own my own home (mortgaged) and this is why I'll never marry. It's mine and I'll never put it at risk.

You can both trust your relationship and protect your assets. These two are unrelated.
The first thing I would do is to talk to your partner about it. If you don't feel able to or if the conversation turns sour, that's basically your answer.
I have never been with a man who was open to me contributing to his mortgage or with a man whom I allowed to contribute to mine. Financial conversations always revolved around "one of us has a house which means we have some slack in family finances. Let's see what else we can build with that slack". In my last relationship, my partner paid the mortgage and I took over bills and food. This left us both with additional funds to invest separately. He is now in a position to move to a bigger house having overpaid on his mortgage. I paid off a mortgage on a holiday flat, sold it and am now buying a house.
We were commited to the relationship until one of us wasn't. We are both in a stronger financial position regardless.

Obviously, with marriage, there are legal routes to making this happen. But a conversation is what needs to be had first to make sure both parties are on board with this.

I think there’s a middle option between what you’ve said in terms of being unreasonable
yes, protect your assets, seek legal advice on how to do that
but also you need to have a plan of how to make this work as a true partnership where surely you have a home and a life together with trust or I’d be asking some really deep hard questions as to if you’re truly all in on this marriage
in essence I think you can have both? Protect your initial investment and also
move forward together with a shared home?

If the positions were reversed everyone would be telling you not to have a child with him before marrying, so that you could protect yourself.

You need a declaration of trust drawn up by a solicitor, to protect your share and ensure his contribution moving forward is recognised. We were in a similar situation (I was you) and my partner had no issue with this. It cost about £450 with a solicitor I think.

ETA just seen you are getting married which would change things. Get legal advice.

Please protect your assets, none of us know what the future holds. I’d agree with seeking legal advice. It’s a tricky conversation but essential.

i really think you should take independent legal advice about protecting your assets. Especially as you have a child.