Suicide is not a joke and not an excuse. Imagine how the other person would feel? To think you were dead? Not just dead, but that you took your own life? And then later find out that you played with his emotions like a toy? This is manipulation to the extreme.

EDIT: sorry for the harshness, but I had a very close family member who would use suicide as a threat all the time, it destroys you emotionally. I have little patience for manipulation.