You and Teylan used to be close to eachother. But after his betrayal to the Resistance and to you, even though he went back to your side, you still resented him a bit. It still felt bitter to you. It still hurt. Everyone else forgave him but you didn't.

He did keep trying to gain your friendship back though, just like today. At HQ, Teylan went to you when you were coming back from one of the Na'vi clans. He greeted you with a smile and a wave. "Hey, how was your trip?"