Why is my soon to be ex husband talking to the woman who broke up our marriage if it was just a fling?

You keep asking this question so I suppose you aren't liking the answers. But, they will remain the same. Your husband had more than a fling. He's got serious interest in this other woman and is only waiting out the divorce to be over before moving on with her. I get the idea you regret filing for divorce. If that is the case, talk to your husband and see if he will go to counseling. Otherwise, give it up and let it be over.