Winning an ex boyfriend back does not require you to go to him and beg him to come back to you.
Just think for a minute if you are truly going to get him back by further hurting your self-esteem? There are other successful ways by which you can win him back without having to lose your dignity.
Not just because you have realized the terrible mistake that you have committed, you are going to hold his feet and plead him to forgive you.
This does not work.
Instead, you should concentrate your energy at arousing his feelings for you again.
Show him that you are still the person for whom he fell.
Find the pieces of the puzzle and reconstitute them.
Make every possible effort to really become that person again if you have changed.
If he notices you, he should know that you are the same.
However, if he does not, do not worry because there will be someone else to appreciate you for what you are.
After that you have broken up with him, let him know that you apologize for what happened and for the pains that you caused him, if that is the case.
But, avoid begging him.
Just tell him in a way that you appear alright.
You need to be brave and accept your mistakes.
Tell him that you do believe that your relationship could have taken another trend if things were worked out in a different way.
It will be better if you can adopt a positive attitude.
Your honesty and humility may just impress him and he may just realize how special you are.
Now, if your ex really has feelings for you, he may reconsider things and want you back.