Why does text like a dad?

So basically my crush wished me good luck before an exam and said you will do good.

i texted him asap after getting the result i was excited and told him omg ur good luck helped and he sent me this “ Wow that’s amazing good job !!” Like what?😭

Updates
7 mo
I’m just confused whether he’s being polite or genuinely likes me cuz he sounds like a dad on text
Why does text like a dad?
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