You didn't realise the tear that fell down your cheeks and landed on Taehyung's forehead, causing him to stare at the broken look on your face.
His dark brown eyes bored into you, into your soul. You realised what you said, and there was nothing that you could do to take it back. It was obvious at this point how you felt towards him, and you couldn't conceal it anymore. You crossed a line of the relationship that you had with him, and immediately felt vulnerable.
You ruined it.
Yet another relationship, of yours; of his. You may as well have broken his heart, just like everyone else. At least then it would have been better than unmasking your real feelings, your love towards him, knowing that he wouldn't be able to return it.