How did you do it the first time? By being demanding, jealous, clingy and bitchy? If you did, just do more of it, and soon you will have him back. If you did something else (and I imagine you did), you have to remember back to what that was, how that was, what made you and he enjoy each other. You have to notice what it was that the OW gave him that made him "fall in love" (BTW, I don't buy that garbage for one second...). Be the OW. Be a non-judgemental friend who shares with him, supports him, empathizes with him, doesn't demand he behave the way you want him to at the expense of his freedom and happiness. One how has her own life and allows him to have his. Be what you imagine he would fall in love with, and he will.
What did you do to draw him back to you from the brink of divorce? What made him choose to come back to the marriage instead of running to the OW? What ever it was, it looked like it worked, and it now seems you've stopped doing it. What ever it was, try doing more of it again.
That's how you get him to fall in love you. Simple, but not easy.
