I am going to exaggerate to prove the point.
You came to an agreement that she would pay you off when you were quite happy with that and she paid you.
You then remained together for another 40 years. You have a claim on the house because it’s still the marital home and the agreement that you had has fallen off the edge of the planet through the affliction of time.
If however you didn’t remain together for another 40 years, but you remained together for a week, then you have no further claim.
Your claim against the property is going to be small but there is one it came down to a legal argument, you may find it’s going to cost more to have the argument the property value that you would be entitled to.
Can I clarify anything else for you?
I’m happy to answer any specific points arising from this.
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If you still need any point clarifying, I will still reply because the thread does not close.