I don’t see why it is a breach of tznius.
I don’t see why it is a breach of chivalry.
I don’t see why it is following the goyish ways. There are obviously boundaries to when we don’t follow goyish ways, for example we wear shirts instead of fig leaves.
The reason we do it is because it is romantic. So is taking her to a lounge and shmoozing, taking her out to eat, buying her a ring, etc. There is nothing wrong with that.
Popa.