Onu went to jail for HER, he stood by HER, and now he is letting her go off just for HER! I feel Onu wants Taani to move on in life with Subodh... He is extremely hurt and shattered with everything, and wants her back, but it's afterall 'Tere Liye'... His anger, madness seems real... He is just the way he is... He had made himself so tough while returnign from USA... Taani slowly broke that shell which he had made around him... And now, since he isn't the tough-hearted Onu anymore, he is shattered! That is making him go crazy! Look at the various instances he has been going through... He'll have to realise he was wrong, to land up in asylum...