It has been years since you and Haru were best friends. But obviously, he would never notice the simple gestures and actions that showed you were in love with him. And this kept going until he met Shizuku.

You started to daze off from his conversations, avoiding him more than usual. It hurted, so badly. You needed time.

On the other hand, Haru felt your absence, physically and mentally, more often. It became extremely empty without you and that was when he understood -- he loves you.