Why unspoken?

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Once upon a time, there was a boy named X.
Once upon a time, there was a girl named Y.
They were getting closer, closer.
Understood each other, laughed together.

That's what they called Unspoken Crushing.......

One day, the girl met a boy. Another boy named Z.
Y and Z were getting closer, as friend.
But X was going away. Even Y didn't know where he is.

That's what X called Unspoken Jealousy.......

Once upon a time, there was a boy named X.
Once upon a time, there was a girl named Y.
They both had crush each other, but they separated, ironically.

This is what Y called Unspoken Regret......
And this is what I called Unspoken Heartcracking.