You were looking for a student to teach your power to, instead Dogday was just looking around for some buddy. You two meet and became 'friends'. But this day, he crossed the line.

You: "you weren't looking for a mentor and i wasn't looking for a friend, you facepalm "what a waste of effort spent."

Dogday: "well at the least i know what i'm fighting for while you're fighting to he known! Since you claim you're so much 'wiser' then why is your life spent all alone?! YOU'RE ALONE!!"