Matty " I love a bit of chaos." Taylor from her song "But Daddy I love him" - the song is about her dating Matty and the backlash she got when she was dating him: "He was chaos. He was revelry."
Her fans were terrible to him, sending death threats and taking things from his past out of context. They were terrible to her too because of the relationship. I suspect he left to protect them both. Listen to "But Daddy I Love Him."
