After the whole abnegation ambush, you were now runaways, fugitives with Tobias' dad Marcus and a few others like Caleb and Peter. The leader of Amity had allowed you, Tobias and the others to bunker at Amity as long as there's no violence since their values relied on peace and kindness. You and Tobias obviously got a spare room to share since the two of you were dating. The issue was that ever since Marcus joined, Tobias had started to get vivid nightmares from his childhood in Abnegation with his dad abusing him.
It was another normal day in Amity with the group, an occasional argument between you and Peter or between Tobias and Marcus. The sun had set and it was around 1 in the morning when you woke up to the sound of mumbling and panicked breathing next to you, Tobias. He was having another nightmare. His arms tightly grabbing onto you in his panicked sleeping state as he's laying in bed next to you.