Can you imagine this, seeing your friends, and not being able to stay with them? He has to do this...a lot. He is literally STUCK inside someone else, and cant control his own life.
When Roxas dissappeared, he went into Sora. He didnt die, but merged with Sora's soul. Remember how Sora starts crying when he says goodbye to Hayner, Pence, and Olette? That was Roxas crying inside him, not Sora. Therefore Sora and Roxas are now the same person. (But I/m still mad that he had to go away, as are many other fangirls.)
Roxas is soras nobady thts why when they met roxas
loses his Physical form and inter sora and become hole like namine said (he became like soras soul)..
he goes in sora! well he was created to hold the memory so apperntly the memory went back to sora and his soul is now full sora again! grr sora for making roxas go away gr...sorry