Marion: This guy has had the hammer dropped on him before. His request for a pre-nup, combined with his strong reaction to your suggestion regarding a “nice” dinner would certainly suggest he has been put through the wringer by some woman in his past and is absolutely certain he won’t let it happen again.
While, as a man, I certainly hear what you are saying as regards a “nice” dinner, I also (as a man) agree with what Kewp said regarding manipulation and moral suasion. You have to be careful with someone like this (your date, not Kewp), given what has undoubtedly happened in his past.
I would certainly recommend some specificity with him as to what constitutes a nice date, and with the caveat that you are looking for something more in terms of the event, not the cost.