And u also even know,that not even once he spoke truth.Most of his statement are lies whether it's exam test or to manipulate somone.And ur believing his normal statement. He always give answer which he think is beneficial and don't put him in trouble. When someone ask him do he like Horikita? Do u even think there is slightest chance that he will admit in front of everyone that he like her. There is 100% Sure that he will deny it.Don't just read lines in psychology novel.Thr same goes for the time when he was on date with Satou and kei was also there.He said he like Genki girl.If he know that genki word this means he also know that Satou and Kei are genki type.Do u think he would have said he like other type when he is in date with Satou? It was obvious that he will prefer the answer which won't give him trouble,he himself said that he will go with preferable answer. I believe his confession also ulterior motive but let's leave it.