Tell me exactly what I did wrong.

[Dom R]

So I just held back. Like I said, it's not his not coming that bothered me, it was the rude way that when I did him the favor of NOT making a demand, he reacted by hanging up on me.

he wasnt nice, by hanging up on you.
you werent nice, by not communicating with him.
he could obviously tell that you were extremely huffy with him somehow. but you refused to communicate.
In some ways, his hanging up, was a defensive move.(HE probably saw it that way, anyways)

PS: You "dont make a demand" on him all the time.
Right now.. you're "not making a demand" on him.
and now
and now
and...
get the point?

I think you should only expect gratitude from him, when you actually DO something, that he is actually AWARE of.

He had no idea what you wanted. he knew that you wanted "something", but you didnt ask for it.

That doesnt give you brownie points, for "not asking for anything".
It actually detracts from your "nice, easy to get along with girlfriend" bank, for not sharing what you'd like from him.

There's "demanding" and there's "asking for a favour".
I'm sure he doesnt like "demands".
I'm guessing he doesnt have much problem with favours.
Not sure why you would even want to be around someone, who had a problem with you even asking for a favor.