Is dating the same as boyfriend and girlfriend?

Generally speaking, dating describes a less serious level of commitment before either person is ready to describe the other as a girlfriend or boyfriend. This is not a firm rule because the terms have no strict definition.

Does dating mean youre his girlfriend?

I would say dating someone means that you and another person are consistently seeing each other in a boyfriend/girlfriend type of manner. I think back in the day, dating was more loosely going on dates with one or many people, but now dating is the pasts equivalent of going steady.