Far Cry 3 Walkthrough - Citra's Favor
Speak with Citra. Then exit her temple. You'll bump into Dennis on the way. He is drunk and a little angry at Jason. Perhaps jealous of his relationship with Citra. Exit the temple and then fast-travel to the doctor's place.
Go to the cave with your friends. Jason will tell them the news that he has decided to stay on the island. This greatly upsets Liza and everyone, as you could imagine. Exit the cave.