There is no context in Duolingo, but here one is readily imaginable:
"I don't know what happened at that party. When I woke up, I was in a swamp surrounded by grinning swamp creatures, and my best friend has been avoiding me ever since."
"What were you drinking that night?"
I'm just puzzled at seeing the Preterite in conversation. I have previously been taught that the Preterite is used only for the simple past and imperfect tenses in literature and this is what I have found in reading: Preterite for narrative; Perfekt for conversation. (A few common exceptions apply)