I'm not going to contact my friends long distance boyfriend to tell him that she committed suicide
That sounds like a serious omission. Why don't you want to contact him?
She always complained about his shortcomings , which I find annoying. But, he has cheered her up when I was away.
Even though their relationship was complicated, you should let him know what happened. People will think that you are evil for not letting him know.
I wouldn't hurt him too bad. I'm planning make him feel pain, but not enough to kill him.
I am not sure I can understand fully what is going on here but it is customary to notify people when you know that someone they care for has passed on.