TBH, I'm not quite sure what you are asking...

I don't see an ulterior motive, if he was wanting sex, like you thought, that's not "ulterior" as you were wanting and expecting it too.

You texted him saying things like "nevermind, you're wasting my time, don't show up", now you're wondering why he never replied?

Seems like his silence and disappearance is him responding to your request(?)

If you don't want people to leave you alone, its best not to ask them to do so, they'll probably listen.

Maybe he did want to break up with you, or discuss a way forward, I have no clue, from what you've written you didn't give him the opportunity to do either...

Have you tried making contact after that? Explaining you were upset and didn't mean what you said? Or was that your last communication?