Of course your H is jealous -- why wouldn't he be?!?
You are wonderful, vibrant person, full of life, and it was only a matter of time before others began to notice. We knew this day would come. We all told you that you would do well, that the tables would turn. And they have.
Unfortunately for your xH, he made seriously flawed decisions and let go of probably the best thing that's ever happened to him. Not only that he made all of the idiotic moves a WAS can make to burn the bridges behind him. Given his poor judgment in this his own future was not so assured. And now the chickens have come home to roost.
Speaking for myself, part of me is pleased when justice is served on a WAS. But the other part of me is still a bit sad for him. On several levels. It wouldn't bother me quite so much if it weren't for the fact that the two of you had seemed to be really trying to make this co-parenting arrangement work, and even with some good will between you. Now he is reacting poorly to your moving onward, and allowing this to jeopardize the situation for the kids.
Yes, it's sour grapes and jealousy. But I think that is only part of it.
You see, I can partially relate to some of what may be eating at your xH. No, not the adultery, and unfaithful B.S. he subjected you to -- no way. I mean the fact that he, as a father, has to face the prospect of another man coming into the lives of his children. That is what drives an icy dagger into my own heart. If your ex has any degree of attachment to your DD's, as I am sure he does, it cannot but feel the sting of thinking that his little girls might have another father-figure crowding into their lives.
If so, I do understand and sympathize with such sentiments, although I cannot condone any of his poor reactions whatever the cause.
And lest any of our comrades here continue to cast stones in his direction, I would suggest they put the shoe on the other foot. How would they feel, be they mother or father, if their ex were to do the same, to bring in another person to act as a parent to your children? I am not saying that that is indeed what Lwb is actually doing, I am just painting a picture of what might be going on in her exH's mind.
Lwb, babe, your xH has been a fool -- we all know that. I am so proud of you for always taking the High Road; you comport yourself with dignity and grace. I count myself lucky to have known you. And I am very, very pleased to hear how well you are healing and carrying onward in your life. You deserve all the joy you can muster.
All the same, please, just keep in mind that even your xH deserves some compassion (I know you know this already), idiot though he may be. (And I will pray that he refrains from making compassion for him next to impossible.)
(((((Hugs))))) and blessings, always.
(There, now let my own xW still try to make the case I have no empathy or sympathy for others! )
) 
