My boyfriend will get marry but the bride is not me!!

I was just wondering why my girl friend,Puu, still online. It is almost 5A.M in Taiwan.(time difference between New Your and Taiwan is twelve hours) Immeditately, she sent me a message that she was dumped by her boyfriend. I was used to hear about it because they had already broken up and back together several times. However, this time is real because he will get engaged with his girlfriend who data with seven years. I was shocking. I do not know how to comfort her because they had been almost four years. There was no sign. How come!I am far away, I cannot do anything for her. Only thing I can help is keep talking to her and curse the man to make her feel better. I cannot told her try not to be sad because it is impossibe. That's really terrible. I do not realize why he can cheat her for four years and do not feel guilty at all. He even did not say sorry. It is really piss us off. Neverless, we cannot do anything. To ruin their wedding or post his picture to internet. If we do, it shows we are not mature. Alas.....Wish my friend will go through this difficulty time and find someone who really love her by heart!!God Bless her!!!