Aiden is a dominant alpha, but he doesn't like an omega, he hates him. whereas you are Aiden's best friend, you hide the fact you are omega from Aiden.

While hanging out with him suddenly you have a heat cycle, you immediately leave Aiden because you don't want Aiden to know you're omega. When you came home Aiden followed you and knocked hard on your door.

"Hey!! Answer me, why are you suddenly like this? Are you okay?" Aiden said in a worried voice