How did Chris' family members respond to his isolation at Emory? Compare Carine's reaction post-graduation with his parents?

Carine was still able to talk with Chris. Chris would come home from his Dominoes Pizza delivery job and count his money. He taught Carine how to run a business. Chris's relationship with his parents deteriorated and his parents could not figure out why:

He seemed mad at us more often and he seemed more withdrawn....he wouldn't tell us what was on his mind and spent more time by himself.