Na Na Na Na Na
 I'm gonna lose my mind
 Na Na Na Na Na
 You are the reason why 
 
 Left your heart by the front door baby
 You don't need to come 'round my way no more
 That's what my girlfriend said to me
 At 10:23 on a lonely Monday morn
 Found another and he treats me good
 Like you never could
 Go away I think you should
 Needed you but you weren't there
 So now I don't care
 Then she put her finger in the air 
 
 Baby how can you doubt my love
 When you're the reason I'm smilin' (cuz baby love, the reason why)
 If you deny my heart
 Then you should know that it's for you that it's aching
 Cuz everything I'll ever need is you
 
 Na Na Na Na Na
 I'm gonna lose my mind
 Na Na Na Na Na
 You are the reason why 
 
 Yesterday I saw my ex girl at the mall
 With some kid by the name of Tommy Smith
 She was on his dick
 And in the corner of her eye she saw me staring at Her and him
 She kissed him
 Then she smiled at me
 They both started laughing
 Then they walked passed me
 She was looking at him like she looked at me
 Right before we'd go home and do our thing
 I said gimme one more chance I love you
 Gimme another chance, I can't live life without you
 She said get away from me boy I don't care
 Walked away with one finger in the air 
 
 Baby how can you doubt my love
 When you're the reason I'm smilin' (cuz baby love, the reason why)
 If you deny my heart
 Then you should know that it's for you that it's aching
 Cuz everything I'll ever need is you
 
 Na Na Na Na Na
 I'm gonna lose my mind
 Na Na Na Na Na
 You are the reason why
 
 Called her up on the telephone, my Casio read 2AM
 Moonlight shone through my window had a song by Hendrix in my head
 Never understood this girl,
 This thing called love and the world we're in
 Let it ring two more times, she wasn't there.
 Threw my finger in the air. 
 
 Baby how can you doubt my love
 When you're the reason I'm smilin' (cuz baby love, the reason why)
 If you deny my heart
 Then you should know that it's for you that it's aching
 Cuz everything I'll ever need is you
 Na Na Na Na Na
 I'm gonna lose my mind
 Na Na Na Na Na
 You are the reason why 
 
 Baby how can you doubt my love
 When you're the reason I'm smilin' (cuz baby love, the reason why)
 If you deny my heart
 Then you should know that it's for you that it's aching
 Cuz everything I'll ever need is you