Forgotten Past, Furure Near

Together then, but now were not. Time just passes on the hands of the clock
Days go by and years complete. Sometime you'll come and dare to knock
My heart is weak, you weren't the last. They all left, my one tear fell.
Once was when, but now is here. And now it's right for me to tell.
You went away and left me lie. My hart broke down, it's just not right.
Return, react, back you are, to treat me like you did that night.
But not this time, I have changed. Understand not, one day you will.
Go to the next, I'm there no more. Now you must find, another heart to kill.