I've always thought that they were together for a very long time... even when they both had other partners. They were together as fwb. And Harry really fell for her and Taylor fell out of that love she felt. Harry was younger and not ready for a steady relationship. Even though Taylor thought he was mature for his age. Maybe 2015 or 2016 was the last time for them together... and then she met Joe. Maybe that's Harry's biggest heartbreak. Now he has to move on and finally realize that he lost her. I think they really had something going on for longer than the media knows about. Too much on and off. I think he is still writing songs about her... and she is also writing about him. I wish them truthful happiness.