I think at first, the relationship was starting out really good. But then they started to fight a lot. She tried to fix it, but he won't let her in, and keeps pushing her away. As in, he's a little bi-polar. He'll hate her one minute, then love her the next. Basically what she means by nobody wins, is that she's losing someone that she loves, and he's loosing what could have been, and now he's missing out hence the line "Look what you've missed, living like this."
I think at first, the relationship was starting out really good. But then they started to fight a lot. She tried to fix it, but he won't let her in, and keeps pushing her away. As in, he's a little bi-polar. He'll hate her one minute, then love her the next. Basically what she means by nobody wins, is that she's losing someone that she loves, and he's loosing what could have been, and now he's missing out hence the line "Look what you've missed, living like this."