《I Don't Know Why》的歌詞如下：
女：
I don't know why
I keep coming back to you
Even though it's bringing me down
男：
I don't know why
I keep going back again
Even though I know it's wrong
女：
Every time I try to leave
男：
You pull me back again
女：
And I can't deny
男：
What you do to me
女：
It's not like I don't care
男：
But I don't know what to do
女：
When I'm with you I feel so low
男：
I don't know why I feel so blue
女：
You push me away
男：
You pull me back again
女：
I want to break free
男：
But I keep coming back to you
合：
Why can't we just face the truth?
Why can't we just admit it?
We both know this can't last forever
Why can't we just say it?
Why can't we just do it?
Break up might be the best thing for us
女：
I don't know why...
這首歌曲表達了情侶之間糾結的情感，當感情出現裂痕時，卻無法面對現實，一次次地回到問題根源。