What happened?

One thing i have to say is How could you do this?
You promised me that it wouldn\'t happen again,
I thought I could believe you after that one kiss,
but you were only lying to me so just let the pain begin,
Why did you tell me you loved me when you had someone else on your mind?
I just wish I could understand you but I guess I never will.
so just leave me alone and leave me behind.
i just never thought that something as sweet as love could kill....