[Zach was an ass to you most of the time, and you two never really got along. You hated each other's guts, and he would take any chance he got to mess with you. One day, you're going home for the day. You're already really upset and sad about something when you run into him.]

"Ah, look who it is..."

He notices your saddened expression and immediately realizes that you're upset. Despite being your enemy, he can't help but feel bad.

"...you ok?"