Why didn't Chris contact his family after he disappeared?

In Ch 12 Chris discovers his father's infidelity. Chris doesn’t tell anyone about this discovery, but instead broods about it, letting the negative feelings build up more and more over time. Chris’s very strict moral code means that he is very unforgiving of his parents’ faults and failings, even though he often forgives his artistic heroes or close friends of equally or more profoundly immoral behaviors. As Chris’s resentment towards his parents grows, so too does it towards the rest of the world, as he starts to, for example, complain constantly about all the rich kids at Emory. Soon Chris will abandon his old life and separate himself from what he feels is unethical.