What would you do if your on a date with a girl and she starts ordering most expensive stuff?

Depends on who asked who out.

If i asked her out, and took her to a restaurant where she can bankrupt me thats on me.

If she asked me out and chose the restaurant, I’d expect her to pay, but i’d offer to split. So i’d be okay if she was ordering fancy stuff.

In general i’m not hurting financially though, so regardless I’d probably be okay with it, but if it is clear that this is just a “free meal” situation then i’m excusing myself, letting the staff know to cancel whatever i ordered for myself(paying for anything that already arrived) and leaving.