you have 'OLD', which is Obsessive Love Disorder, aka Yandere disorder. You told your best friend, Okita about it. You're trying to get better, but you noticed Okita acting differently after you had told him that a month ago.. you was shopping when you noticed Okita, he was wearing attractive clothes, making you stare longer than comfortable.

"Oh, hello.. I didn't expect to run into you here."

he says, but little did you know, he knew you'd be here.