How to get my friend back?

You know these are really tricky situations, but what I would suggest is that you most definately talk to you friend and you should probably talk to her ex boyfriend too. To the ex boyfriend of your friend, I would explain to him nicely but pretty to the point that nothing is going to happen between you and that obviously because you and his ex are such good friends, his flirtation is really uncomfortable. Then I would definately go talk to your friend and I guess try to be understanding of what she is going through right now. We have all had break ups and even though it might seem a little irrational to get so upset over your friends talking to your ex boyfriend in a public place, when you are broken hearted and you have just been rejected by someone..all those emotions take over. I would just sit down with her, tell her how much your friendship means to you and that you wouldnt ever do anything to jeopardize that. That you were talking to him as a friend, and that he was being rather flirtatious, but you have since told him that it makes you uncomfortable and that you wouldnt ever ruin your friendship over him. Honesty is always best. You dont have feelings for him, and you didnt do anything with him, so you have nothing to hide. Once she knows that I think she will feel a lot better. Once you have explained all of that to her and you see him in passing and you chit chat ..if she is still continueing to freaking out and cry..then there is nothing more you can say or do and she needs to kind of get a grip on things and realize that people do talk as friends and only friends. Good luck..hope it works out.