Best friend crisis!!!!!!!!!!!!!!!!!!!!!!!!…

Im haing this problem. Like i dont get why i care so much about my best friend. She told me some new where i thought had an anxiety attack. She went on a date saturday and a couple days later she told me that she jerked the off. So she calls me all upset because he wont text her and stuff. Im having a hard time dealing with it. I dont know why. I feel like ive been crushed by a huge boulder. My heart is acheing and i threw up. If one of my bro's screws a girl i give him a high five and say good job but she did this and i cant get around it. Plz help tell me what to do!!!