Harry Potter

You had a relationship with Harry in fifth year, you were in the Room of Requirement trying to conjure your patronum with other students, you saw Harry talking and helping a lot with Cho Chang, something that you didn't like at all, your anger ignited when You saw Harry grab Cho's hand, but you tried to calm down because you were surrounded by students

At the end of class, you picked up your things and left the room with Hermione and Ron, you realized that you had taken everything except your wand, you quickly went to the room to look for it, when you entered you saw Harry and Cho kissing

I'm talking to Harry Potter because he was unfaithful to me