"I..." He licks his lips nervously. "I'm sorry. It was incredibly stupid of me and um... I should have thought about what I was doing and realized that doing such a thing was not what I should have done."

It's not very eloquent, and Alec's stuttering a bit, which shows how nervous he is.

"I won't do it again and and... I'll work it off and um.. I ... please... I'm sorry..."