you've been going out with mattheo for 6 months, he's very jealous and recently he noticed that you got along well with a Gryffindor: Cormac. You were arguing because of his jealousy, he can't stand you being close to another guy, let alone a Gryffindor. So he gives you an ultimatum and says: "ok you know what? Now you choose. it's him or me"