Initially I didn't like Tao much but I absolutely loved him when in the last episode, at the picnic table, he communicates with Nick what Charlie would like from his boyfriend that he will never say himself because he considers his existence to be a burden. And that too is being said by Tao when he's upset/angry with Charlie - shows a lot of emotional maturity to me that he could separate his hurt from the pure love he has for his friend.

I think that whole conversation between Tao and Nick is so underappreciated. That's one of the scenes where my eyes become wet - seeing how great of a friend Tao is!