I have a MAJOR PROBLEM!!?

i think you both messed up in this story, but you messed up more. the first time you did something wrong, you hurt her, but she forgave you. but the second time you went out with her ex, you already knew it would hurt her, but you didn't anyway. so since you did it a second time, she wasn't as forgiving. you should have learned from your mistake, but instead you were selfish and did what was best for you. i don't blame your friend for being mad. i think the only way to fix this is to invite your friend over for a sleep over or something and talk to her about it. tell her how you feel and how sorry you are. you also need to persistently show her that you still really care about her and want to be her friend. good luck=]