Imagine that you're not getting along especially well with someone.

Imagine also that they've been off on a trip, travelling in a problem-ridden car that has recently been stalling a lot and has been displaying brake light problem indicators.

Imagine that you don't hear anything from them after their trip, and you start to worry a little bit about their safety. More time goes by, and still you don't hear anything. Finally you send an email and leave a phone message, both saying, "Hey, can you just send me a quick response to let me know that you got home okay?" Still, no response. Hours go by. You know that, in the course of this person's daily routine, they would have seen at least the email by this point in time.

At what point is it okay to respond with anger instead of (or in addition to) relief when you finally do hear back from them?

Is it reasonable to be angry when somebody knew that you were worried about them and did not respond so that you could stop worrying? Is it still reasonable to be angry even if you and they were not getting along, and they would have preferred to just avoid communication with you?

Yeah. So I've been worrying about someone, and finally recieved a non-chalant, vaguely cold response from them indicating that they are alright. So I'm a little mixed up about what I'm feeling, and not sure that it's all so very reasonable. Blah.