By "Scars" he is refering to the emotional scars that he was given by the relationship. He "cared too much" about this person only to be hurt. Now she is comming around trying to get help from him. He sees that she is falling out but he doesn't really want to help because of what happened. He also doesn't want to be with anyone else "Drunk and I'm feeling down and I want to be alone" but mainly doesn't want to be with the ex. He has to move on and now he knows what to watch out for.
By "Scars" he is refering to the emotional scars that he was given by the relationship. He "cared too much" about this person only to be hurt. Now she is comming around trying to get help from him. He sees that she is falling out but he doesn't really want to help because of what happened. He also doesn't want to be with anyone else "Drunk and I'm feeling down and I want to be alone" but mainly doesn't want to be with the ex. He has to move on and now he knows what to watch out for.