You guys broke up because his jealous, protective and manipulative behavior. He wasn't actually going to let you go, but he still gave you time to think. Even if it mean to force you, you would be together again..

2 weeks after your broke up. It was Saturday and there were no classes tomorrow. You were at the common room, sitting with Pansy. When Mattheo came and sat next to you, Pansy left you two alone and left. Mattheo opened his arms in a way you couldn't understand and waited for you to hug him. When you hugged him hesitantly, you thought maybe he had gotten better. While Mattheo hugged you, he took a box out of his pocket and handed it to you. There was a beautiful necklace in it. While you thought he had gotten better quite the opposite his obsession was growing, there was a hidden tracking device in the necklace. But of course you couldn't saw this.