OK, same principle, though - saying "let's go to Chez Trop Cher," without intending to pay for it, and not saying you intend to pay for it, is wrong, whether you're male or female. The only slight difference is that perhaps the GF comes from a culture where men are expected to pay as a matter of course. However, in that case, it has been expected that partners who are not users either let the man pick the restaurant, or make sure that they do not suggest anything expensive.
The OP clearly comes from a tradition where either side pays their own share, as the standard. If the GF isn't, then he's going to have to learn to put the brakes on, and respond, "No, I can't afford Chez Trop Cher. Let's try Rick's Reasonable Cafe, the food is good there."