Machiavellian delay
A stupid move where you wait just so you can pretend you're not excited, even though you're probably checking your phone every 30 seconds.
He waited a whole day to reply so he could look like he didn’t care, but he was checking his phone every 30 seconds.
She took her time replying even though she was dying to text him back.
He delayed his reply just so he wouldn’t look like a nervous idiot.