Unstable

I understand
That you've been hurt
I understand
You're scared
But how that makes it okay
For you to run silently
Precisely when you said
You would be there
I don't understand
And when you called last night
Please understand
I didn't pick up
For exactly that reason;
I don't have a never-ending supply
Of blind sympathy-
The line ends when you begin
Leaving scars upon my heart
I guess you did not know
And I guess it's time you knew
That I'm not disposable,
I'm not going to wait
While you trample me underfoot
The torrent of your unstable emotions.