Mid life relationships and assets - your thoughts

[Gigi100]

I am 40 divorced no kids, partner 57 divorced 3 adult children and grand children. I have 3 properties no mortgage, he has his house with 3 years mortgage left. He wants me to invest money with him into a property. He wants a 4+ bed for just the 2 of us. This would mean mortgage. He also tells me he wants to retire at 60. I am not planning to retire for another 20+ years as I love my job.
Considering there are his children and we are not married. Together 3.5 years. I am a bit cautious.
He wants to get married to me.
Marriage protects assets but here I see plowing money into unnecessary large property where we could have something abroad or simply something bijoux for the 2 of us and holidays 3x a year.
He is very concerned his friends all have houses and he wants to keep that status. I don't. My work involves travel so I do like comfort of something realistic in size and maintenance.
Am I funding inheritance for his kids here if I agree to his proposal?
Your thoughts.

If you wont take on the advice given here,( why start all the threads?)then ask your solicitor.
On mn we see women completely screwed over time after time financially. Every single reply has told you to not marry him.
Financially it does not advantage you in any respect.
You dont want a big house in the country
You dont want to live in a mausoleum
You are wealthy, younger & may still be able to have a child
You are also an only child will inherit more.
You are over generous & running around after his dc who dont reciprocate
You are on the outside Sasha
Have you heard of the sunken costs fallacy?
Cut your losses & find someone your own age who wants the same things as you

He's clearly told you he's after your money so you know what to do, or not do in this case!

Nurse with a purse as you become his carer and work to fund his retirement and provide his children with additional inheritance.🙄