Because your attachment system doesn't know what a phone is. It evolved to monitor one thing: is the person I depend on still there? When you text someone you're attached to and nothing comes back, that system reads the silence the way it would read a partner walking out of the room mid-sentence. Not as missing information. As threat.
If you lean anxious, your system responds to that threat with hyperactivation: it turns the volume up. Checking the phone, rereading the thread, replaying the last conversation, drafting messages. All of it is one strategy with one goal: re-establish contact now.
The cruel part is that the strategy made sense when the signal was a real disappearance. Over text, the same machinery fires for "left phone in the car." Your alarm isn't stupid. It's calibrated for a world that no longer exists.
