You don't "have" to disclose anything.
You cannot make a deep emotional connection with her, if you initially engage under a cloud of mistrust and a fear of losing what you really love (your money).
Discussion
An argument can be made that an concealing their Wealth is protecting their life's work.
We all exchange our services or the product of our service for other forms of Wealth (i.e. money).
Why can we not go through processes to protect the fruits of our labor, what we exchange a portion of our life to obtain?
Think everyone should have mistrust when dealing with a completely new person, let alone a potential mate. That is why its a process of developing trust.
I am his life's work.
The situation is different when in a sacramental marriage, a committed relationship.
I'm arguing this point for someone who is unsure whether this is the person they will spend their life with, not a sufficiently explored courtship or marriage.
I married him because he approached me as if he were completely sure and I got overwhelmed by his confidence.
That's what it is, to be swept off your feet. The stuff of every romance novel and the tale every happily-married woman will trot out for anyone willing to sit still for long enough to hear it.
Because she knows that she is living the dream.
I'm happy that was what happened in your relationship, I'm not dissuading anyone from having that expectation.