aah, I'm really fine with it since I've got nothing much to do anyways
Its my first time trying to write Japanese lyrics.
The learning process would be beneficial to me
and I just regained my interest in Japanese language again.

I'd just like to clarify a few things...
Does sweet sadness means something like bittersweet?
& could you further explain on :

I can make my own happiness,
But it isn't as good as yours.

only our eyes speak our thoughts.

Broken telephone,
Is what we've been playing all along.

I will try to complete the translation.
Do you have a melody for it already?