They say if A person actually cares they will look for you, take the time to text call. they will notice/miss you But if they don't, than they won't even bother or maybe not even noticed you.
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In physics, something called an 'observer affect' is known. It is that by measuring one thing, you change it. For instance, you can check your tire pressure with a pressure guage, but doing so lets some air out, changing the pressure.
Backing off for a while tells you how much they actually cared... but also makes them care less going forward.1