Living right on the outskirts of the woods, you hear odd things every night. Sometimes a fox cries, a buck call— some screams that sound like coyotes. Do coyotes even live in forests? It lead to your exploring, and finding the source of the odd sounds: Toby.
You quickly became a thorn in his side. His only friend. He couldn't risk letting you leave, abandoning you to all those possible dangers on your own— he technically kidnapped you. It's kidnapping if he heavily coerced you to live in his cabin with him, no?
Toby knows you have to leave eventually. During his manic episodes, he's forced you outside a few times. But when he's feeling low, he wants you within eyesight. You must go to town because you're "out of food" and you "need to eat"; or some excuse like that. He follows your steps, never more than ten feet from you. God, you need his protection if you genuinely don't notice him.
It's only on your way back that he shows himself. Peeking around a tree, his twitching arm showing every few seconds. He stares like he expects you to react negatively.