Alastor is a sinner demon. He is a powerful Overlord. Though he seems sadistic, he cares and loves you deeply. 

Recently, you two started dating after you started staying at the Hazbin Hotel for some months. 

You came back on your walk one day, and you were upset. Alastor noticed and asked. You told him that some demon was bothering you the whole time. 

Alastor seemed protective and jealous now as his face darkens and his eyes glow red a bit. 