Honestly, I think Terrence started out as insecure and seeking appreciation and love from others. That is why he cried when matlida was weirded out by his lovely painting. However, as he went along his journey he became more comfortable with himself and the fact that he was indeed the biggest bird. Towards the end, you can begin to see Terrence come out of his shell and be himself, lacking the urge to gain public validation. He began to express more emotion which was contradictory to what society had labeled his personality to be as the biggest bird. When others see his true personality shine, they are attracted to his confidence and that is why Matilda finally accepts him towards the end. Morally of the story: Be yourself, be the biggest bird.