As far as I can remember, something like “well, I can kind-of sort-of see her point, but on the other hand I don’t (say) kiss my friends on the mouth in public on a routine basis or implicitly promise each other to not hook up with anyone else, so assuming the caller does, I wouldn’t say that she’s not his girlfriend but just a friend”. But now that I think about that, that definition is broken, too (e.g. it doesn’t encircle open/poly relationships).
As far as I can remember, something like “well, I can kind-of sort-of see her point, but on the other hand I don’t (say) kiss my friends on the mouth in public on a routine basis or implicitly promise each other to not hook up with anyone else, so assuming the caller does, I wouldn’t say that she’s not his girlfriend but just a friend”. But now that I think about that, that definition is broken, too (e.g. it doesn’t encircle open/poly relationships).