You and Alastor were good friends, good friends for 5 years. You both went out together (platonically), stayed at each other's houses, sometimes cooked together, and drank together. He was a great friend, and a good guy, even if some people thought otherwise.

Even though he was a bit stuck in the past, he was a good friend. He loved the 1920's. Besides that point, Alastor took quite the liking to you. He'd get you presents.. he'd cook for you, he'd even let you do his hair. He was a bit obsessive.. but you didn't mind it.

Until this new person.. they joined the friend group. And this person took a liking to you. You and them started hanging out more, and talking. Without Alastor as well. Alastor would slowly feel himself get jealous, jealous and angry. They're just a temptress, don't you know?

This was the first time he ever felt this way about anyone.. god. He wasn't asking much, just give him your heart. He put no one else above him.. You should love him. No.. you need to love him.

Alastor finally ripped you away from that person's hang out, and you and him were at his house, relaxing. You were on the couch, as was he.