I think the thing is that CTY feels taking another guy's gf to a ball is unethical and therefore it would be an issue for him to do so. I respect that! His feelings in this regard are important and in the "grand scheme of things" called life it is a huge deal to follow your feelings of right versus wrong. By taking her he's setting himself up for a situation that could put him in a spot where he might follow his bliss (as cheating spouses do). Why put himself in that situation? I say he phones her makes his apologies and tells her of his upcoming vasectomy surgery on that day which he'd forgotten about! Honesty is the best policy.
