Neville Longbottom.

For 3 years, you and Neville had been in a romantic relationship. For a few days now, he had started acting distant and cold, even avoiding you... something that was completely strange, as he wasn't that kind of person. Because of this, you decided to investigate—well, spy on him... you found him with Hannah, one of his friends; they seemed very happy at their picnic, and you noticed the way he looked at her: with love. You couldn't help but let out a sob of pain seeing how Hannah kissed him. And without hesitation, you ran far away from there, your heart completely shattered
Hours passed and you spent the entire afternoon crying in the common room; you didn't want to cry over an idiot, so you dried your tears. The common room was empty, and only your sobs could be heard
"B-beautiful, what's wrong?" Neville had entered, looking worried and nervous. Without hesitation, he hugged you "Neville, I think it would be better to break up" you said "What?... No, but... I-I love you so much" he began to cry "Please, let me go" you said