How Can I Help My Ex-husband Believe That We Can Still Make Our Marriage Work?

You can never make someone think the way you want them to. YOU CAN NEVER CHANGE SOMEONE. I learned the hard way, once I accepted that I could move on and take care of my self. So try to take care of your self and work on making your self  the best you can be,and LOVE your self, if you are doing that  you will be amazed how everything in your life just falls in to place. Your husband may never come around, but the person that is supose to be with you will.You just have to let go of the things you don't have control of.

If he is your ex-husband then a divorce was finalized. Technically he is not your husband anymore. If you believed that marriage lasts forever and he does too why didn't you work excessively on the marriage before the divorce? I think you should let it go.