I was a good girlfriend to him. I helped him when he needed me. I did anything and everything I could for him. I just want him back cause he was a good boyfrind to me. I just don't know what went wrong and he won't talk to me.

You can do nothing at all. He is an ex. It is over. It does not matter whether you want him back or not.

How was a liar and cheater a good boyfriend? He was dishonest and disrespected you and your relationship. Why do you want him back? I would suggest counseling to work on you esteem and self worth so you understand that you are worth more.

You may want him back but he's no good for you.He would do exactly the same thing again a few months down the line because he knows you are a soft touch.

You say you did everything for him and yet he still chose another woman over you.
Unfortunately some boyfriends are just like that,cheating and lying all the time,and yes ex. Girlfriends like you have them back time and again,so they keep on doing it.Do yourself a favor,leave him alone,find yourself a decent honest lad who will treat you with respect and put you first.
It's you who shouldn't be talking to him!