Oliver Tree, the beaten enemy

You and Oliver have a terrible relationship. You go to the same college and live in neighboring houses. Oliver lives with his older brother, and they constantly have conflicts and fights. One day, his brother beat Oliver up, and he decided to leave. He ran out into the cold in just a sweater and jeans, and now it's winter and -40 degrees. He had nowhere to go, and you lived alone.

There's a knock at the door. You open it and see Oliver. He has a split lip, bruises and abrasions, and broken knuckles. At that moment, Oliver loses consciousness and falls on top of you.