oomis: That is a very unnatural situation. Was all that clearly communicated to the guy? Because the guy’s assumption is that you are simply calling with another “idea”, and that there is not shibud to get back to you with a definite answer. In fact, often there cannot be a definite answer, because you would go out with her, but would rather go out with someone else.
I don’t know why guys think they have a right to say yes first.
So go insist on that. See where it gets you.