Killing, unless absolutely necessary, is a sign of stupidity and weakness.
Madness string 2429
Real friends are the ones who stick by you during your darkest days, and have the guts to call you out on negative behaviors and actions, because they want the best for you. If you have people who only hang with you during your best, but not your worst, then they're not really your friends. I don't know if there was ever any moment she stuck with you during a dark time in your life, but based on this, she abandoned you when you needed a friend the most.