Ouch, this brings back bad memories. Maybe my gang could help you.
You could always play the guilt card and not show her any pain. Make her regret it-
Uh uh. What do you know Baron? Always tough and brooding.
Kathy, there is a bright side to this. At least Baron knows the word "friend". Anyways, glad bear, if she left you, but you stayed loyal, obviously you don't don't deserve her.
What Clide said. Move on, make new-better friends. But honestly, this is going to happen a lot in life.
Even if there is a small chance that she might comeback I wouldn't count on it. Friends don't make you hold back. Plus, if you two might work it out, who's to say that she won't do it again?