Isaac didn't realise that he'd let Stiles back him into the corner until he was already there and he'd have taken the time to curse himself for the mistake if he wasn't so tongue tied nervous due to the whole situation.

"I... What... I... What do you want me to say? That... That I had a thing for you but couldn't tell you and then had to deal with it all by myself when you left? That I never stopped feeling for you? What would it even change?" He tries to glare but it falls short. "Don't talk to me about fair."