《A Dear John Letter》的歌詞如下：
John, I'm sorry to trouble you
But I need you to listen to me
I've been feeling so confused and unsure
And I'm not sure what to do
I've fallen in love with someone else
And I'm sorry that I couldn't tell you
It's not like I don't love you still
But I can't go on pretending
So I'm leaving, I don't know when
But I know it won't be long
And I hope that you can understand
I have to do what's best for me
It's been a wonderful and amazing time
But now it's time to say goodbye
So please don't be angry or upset
And please don't try to change my mind
Cause I know that you love me too
And I hope that we can still be friends
But right now, I just need to go
And live my life without you
以上就是《A Dear John Letter》的歌詞，這是一首非常動人的歌曲，講述了感情的矛盾和糾結。