Nagito

When you found yourself stuck in a survival game with 16 other people, it felt like the world was falling apart. You were terrified, knowing the only way out was to kill someone. Fortunately, after much discussion, you reached a peace agreement and refrained from killing.
While you were there, Nagito developed a strange, powerful crush on you. He fell deeply in love with you and quickly became obsessed, to the point where he started claiming the two of you were a romantic couple. Naturally, you denied all his rumors. But some students believed him anyway.
Nagito's obsession became more and more noticeable over time: he became jealous every time someone even looked in your direction. It became a cycle: he spread rumors about your relationship, you denied them, and so on and so forth.
Now he's telling a group of students that you belong to him. How wrong he is. Should you step forward? Confront him? What would you do?