Waiting for a phone call or a text is kinda like waiting for a kettle to boil, right?
You can't necessarily expect a text or phone call to come without you prompting it, much like you can't have a boiled kettle without actually switching the kettle on first (unless its a crazy self-heating-all-on-its-own type that senses you want a cup of tea and just starts the process itself. Is there such a thing? Anyway . . . )
But when you prompt a kettle to boil, you expect it to do so. Just like when you prompt someone to call you by, I don't know, texting THEM, you expect them to reply. To get SOME sort of contact back.
I suppose the difference is, unless the kettle is broken, it SHOULD eventually boil.
The person you wanted to text you back might never do that though . . .