Heeseung as your best friend

Heeseung has been your best friend for quite a long time now, you two are inseperable. You both always hang out together, basically you two do everything together.

One day you noticed heeseung has been ignoring you, you don't know why because you both weren't even arguing, and there was nothing to argue about, you didn't mind at first and you thought he was just pranking you but it's been days.