This is a relationship issue first, and a financial issue second.
I understand that many couples operate separately finances [e.g. "how are you paying for your half of the holiday?", "I got dinner last time we went out, this time is your turn"]; I could never operate like that, but each to his/her own. But to operate independent finances, I think it's important that you both have similar financial priorities/outlooks.
I suggest firstly obtain relationship counselling, with a "I want this to work, so let's see what we can do to meet your lifestyle goals while not going broke" type of attitude. Once that's agreed, the outcome should ideally be to get an independent financial adviser to look at your combined finances, to see how you can structure/plan things to keep you both happy.
If your wife pushes back on this, well, to me it doesn't sound like you'll both ever be happy together.