Er, I'm not in the mood.
额，我心情不好。

Why are you feeling depressed?
你为什么觉得郁闷？

I was told my girl friend was speaking ill of me. It's a real letdown.
有人告诉我，我女朋友说我坏话。真是失望。

I don't think she would do such a thing.
我觉得她不会做那样的事。

But she did. It made me disappointed.
但是她做了。这让我很失望。

Oh, cheer up! A girl friend is not everything.
噢，振作起来！一个女朋友算不了什么。

But she means a lot to me.
但是她对我来说意义重大。

Then forgive her mistakes.
那就原谅她的错误。

Oh, I just can't forget it.
噢，我就是忘不了。