I feel the song is about a guy who was hurt by a girl in a relationship that failed, and in his head there is just all this sadness and indescribable rage going on (as you hear in the verses and bridge), but in the chorus it gets calm, as if that's him talking to the girl (like DarthFly0 mentioned). He's kidding himself, he's so angry and hurt but in front of people and to the person who hurt him he wants to make it look like things are going good for him.
I feel the song is about a guy who was hurt by a girl in a relationship that failed, and in his head there is just all this sadness and indescribable rage going on (as you hear in the verses and bridge), but in the chorus it gets calm, as if that's him talking to the girl (like DarthFly0 mentioned). He's kidding himself, he's so angry and hurt but in front of people and to the person who hurt him he wants to make it look like things are going good for him.