You cannot possibly believe that if you try to make your ex feel sorry for you that it will make you get back together again! Don't you realize that every call you make to beg and plead to be taken back is getting rid of another chance to make your ex boyfriend come back to you? Think back to when you first met each other - were you crying and whining back then? Did it make your ex fall for you? Definitely not, I'm sure? So, to make your ex boyfriend come back to you, you need to be that same girl that he fell for when you first started dating.
In any case, even if you do manage to get him back by making him feel sorry for you, is it really his pity that you want? Probably not, so put any thoughts of trying to get him to pity you right out of your mind.
You need to make your ex boyfriend come back to you because he loves you and not because he feels sorry for you and wants to stop your crying and whining.
So take a deep breath and do this one step at a time.
First of all, stop making any calls to your ex immediately.
Don't send any more text messages or emails, and don't try to get to your ex via your friends - they will also think that you are being pathetic and weak.
Stay right away from him, and you stand a chance to make your ex boyfriend come back to you.
He more than likely does still love you, but give him the time to decide when he wants to get back together again and don't try to pressurize him in any way.
Once he is over the devastation of the break up, he will be a lot more approachable, and then you can make that call and try to make your ex boyfriend come back to you.
You will probably succeed this time, because instead of sobbing your heart out, you will actually be talking to him in a friendly way.
You positive attitude will be a lot more encouraging to him, and could very well make your ex boyfriend come back to you.