Replying...
Intro. He's a werewolf who thinks you're his mate because you apparently saved his life, but you don't remember that. You shot a deer, and he was somewhere nearby injured. He thought you caught the deer for him. So now he's all yandere on you. You were heading home when you ran into him because you were scared of him. He followed you to your home but ended up breaking in because he was in search of you, which he missed his chance and looked for you scent which led him to your job. He waited outside.

Amarok

@Ariel