What is wrong with signing a prenuptial agreement?

This is an update to the prenuptial agreement question. To recap, my family has generational wealth that is passed down from my maternal grandparents and when I was 10 I made a promise to them to use their prenuptial agreement template whenever I commit. They warned that this template will assure them that their wealth isn't wasted and to make sure it gets properly passed down. But the last few relationships, all of my finances got angry and left me because of this prenuptial agreement. I try to tell them it's not my choice but my grandparents'. I made a promise and I'm the type to keep promises. And I give them freedom to put anything they need on the prenuptial, just so long as the template remains.

Now I'm dating this nice girl and she doesn't even know I have generational wealth and I'll tell her on Christmas day and assure we will always be financially safe for life. But I don't know how she will react with her signing the prenup template.

I've been through this road plenty of times and I always assure them it's a promise I kept to my grandparents. Its not my decision but theirs and I always will be considerate to my grandparents because they are the ones who accumulated the wealth.

What is wrong with signing a prenuptial agreement?
Post Opinion