Remember the documentary "Scared Straight"?
Maybe he is getting a different sort of education in jail than he and his parents had envisioned for him.
This child of privilege is, hopefully, beginning to feel pressures that we can only imagine. He may start to cooperate with his interrogators, but I believe there is no deal making in Aruba.
Anita is probably desperate to get her baby back home. She is a weak link, and may be pleading with him to tell the truth.
Paulus' abundant sweating indicates he has a lot of guilty knowledge. He seems to get all sweaty and agitated when he is asked questions in his home. In his home, where he should feel safest, but apparently does not.
But how would telling the truth get him released?