What happens to roxas at the end?

*SPOILERS*After Roxas leaves the Organization, he goes to the Clock Tower in Twilight Town, where he fights Xion. Once Roxas defeats Xion in 4 battles, Xion starts to fade away and asks Roxas to stop Xemnas and free Kingdom Hearts. Roxas then ventures to The World That Never Was, where Riku confronts and defeats Roxas by finally releasing the darkness within Riku's heart. Riku gives Roxas to DiZ, who then erases Roxas' memory of the Organization and places him in a virtual Twilight Town. This is where Kingdom Hearts II begins.