My best friends has this kind of mental disorder.. bipolar or something like that. Sometimes she freaks out from nothing, she gets mad at me, she starts arguing out of nowhere. I'm not talking about a 15 y/o teen behavior. We are 21 booth. We are practically adults, mature and responsible people. Yesterday she had a crisis. She doesn't understand how her words hurt, or if she does, at that moment she's doing it with the purpose to hurt. She told me the most horrible things someone can tell. At night, I cry till i fall assleep. For the first time I seriously had suicidal thoughts. She isn't just a "bestfriend", she's apart of my life, one of the persons i most respect, trust and love. This mental thing is ruining her life, and mine as well.