Dont go mental!

No matter how upset and how bad your feeling, dont just break down into tears and tell your ex how much you miss them. Especially if they broke up with you, its much better just to flirt with them for a bit and see if they respond. If they really care about you, they will notice. And then they will tell you whether or not they are prepared to see you again. Its a sad thought, but the ball is allways in either your or there side of the court. If they broke up with you, its there decision to take you back, but its also your decision whether or not you punch them in face because of the pain!!! :P