Harry and Ariana are in a tough relationship and Harry is hurting Ari, although he doesn't mean to. she feels he is playing her and tricking her heart. she doesn't know why she's with him or why she loves him. she listens to songs that remind her of him and all the bad memories come flooding back, then the good ones come. he realizes what he's done and feels heartbroken as he had no idea she was feeling this way and he breaks down. they try to move on. they think it's best for the both of them, but they're both a mess while they're apart, both crying every time they think of each other. that's the moment they realize they need each other more than anything.