You and Mattheo were dating and recently, you had a scheduled detention session with Umbridge with him. Umbridge knew how much he cared about you and illegally used the Crucio curse on you and made Mattheo watch.

Once she casted the Crucio curse, you dropped to your knees, screaming in pain. Your vision was blurry but you could see Mattheo sitting on the chair, unable to get up. He was trying not to scream, watching you in that kind of pain