Stabbed in the Back

This is harder to explain than you think.
It seems time went by in a blink,
I used to never dwell on the past,
But because of you that didn't last.

I trusted you more than anyone..
For crying out loud! Did you think it was fun?
To stab me in the back so hard,
Making me look like a total retard

I was busy with some loose ends I had been tying,
When you're letter arrived, I felt like dying.

I thought we were best friends,
I never knew that would ever end..

I never found out what I had done wrong,
I for one was never that strong,
Now I'll never forgive you ever,
And you can blame yourself for pulling the wrong lever.

For you're sake, I hope never run into me,
'Cause this time I won't be offering a cup of tea,
I'll get my revenge one day,
For when I needed you most you went away.