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Four years. That was how long Y/N and Mattheo Riddle had been together before everything finally fell apart. Everyone knows the reason they broke up. At least, everyone knows the version Mattheo tells. Y/N was too much. Too jealous. Too possessive. Too emotional. Too obsessed. She wanted to know where he was, who he was with, what he was doing. She needed too much of him, and eventually Mattheo claimed he couldn’t breathe around her anymore. So he ended it. For six months, Y/N tried to convince herself that he meant it. Mattheo didn’t make that particularly easy. For almost a year after the breakup, he continued seeing her in secret. He answered messages he shouldn’t have answered. He let her into places she shouldn’t have been. He gave her just enough affection to make her believe that perhaps the relationship wasn’t really dead. Then, eventually, he stopped. Or so everyone thought. At the end of fifth year, everything changed. At a Slytherin Quidditch celebration, Y/N walked into a party and saw Mattheo kissing Astoria Greengrass. It was the first time she’d actually seen him move on. And something inside her snapped. The girl who had once simply refused to accept that her relationship was over became something far more frightening over the following year. Her jealousy stopped being something her friends could laugh about. She began watching Mattheo constantly. Remembering every girl he spoke to. Noticing every party he attended. Keeping track of every rumour, every name, every glance. Girls who got too close began learning exactly how dangerous Y/N could become. And the people closest to her noticed. Pansy and Daphne hated what the obsession was doing to their best friend. They told her to move on. They begged her to stop talking about Mattheo. They dragged her away from situations before she could make them worse. But they never abandoned her. Because underneath everything, Y/N was still their girl.