Meaning of それは構わないんだけどね


> 「おはよう、有地君』
>
> 「朝早くからすみません」
>
> 『 **それは構わないんだけどね** 』
>
> 『わざわざこんな時間に連絡をくれるなんて、なにか問題が？』

Why was んだけどね added onto the end of the sentence above?

I guess my question is really, why is it それは構わないんだけどね instead of それは構わないわ or
something else.




けど adds the feeling of "but..." to the sentence. Sentence-end けど/が/etc is
fairly common in Japanese. See: [けど at the end of the
sentence?](https://japanese.stackexchange.com/q/2086/5010)

In this context, this "but" makes the sentence naturally connect to the
following line. He says contacting him early in the morning itself does not
matter, **but** he is worried if there is some problem that actually matters.

> "It's okay, **but...** "  
>  "...contacting me at this time in the morning -- so you've got some
> problem?"

