I'm sorry about your marriage. But like BLB said, your husband or ex, not sure, can only change if he wants to. It doesn't look like he wants to. You did your part and tried the best you could, so it's not your fault. Remember, he chose to break the family once he cheated.
Also, I truly believe that once a cheater, always a cheater. So forget him! Work on yourself and know that God loves you dearly. You are His precious daughter and He wants all the best for you! It gets better with time. I've never been through it myself but I did see my mother go through it and she's a wonderful person who is able to love others as brothers and sisters despite what she's been through. Most importantly, she knows her worth comes from the Lord, not from others of this earth. I hope that you can do the same, dear sister.
Prayers for you and your family.