I guess its his choice, I think everything takes time including time. He is still young, and if he did not ask for your help then leave it like that. I know a 30-year-old guy that has 4 kids from 4 different woman, and I feel like his doing this because he doesn't even know the meaning of love...
I am introvert and an ambivert never been an extrovert. I just hate being attached to a lot of people. I am okay with my small company, at least we are true.
Kimi ni Todoke, I am so in love with this anime. Shouta and Sawako are so adorable, and yes I've been buying a lot of red dog collars because of Maru.:P