I've not been able to get back to this thread sadly, damned RL getting in the way again.. Sick DS, a joint sleepover with my mum, all good, but no time to MN.
LeClerc, wrt the new number, I would change your number on the kids phones if you think they are likely to tell FW.
You are doing this for a reason, to get yourself some headspace. You have a right to it and no-one has the right to stop that.
What have you told your DC btw? are you telling them the appropriate truth? If you are not, then you will be painted the villain by FW and they will have no defence to it and will believe him.
I would sit all your DC down and say to them that you and FW are split, because he was mean to you and that in the end, when you live with mean people, it hurts everyone, makes them sad, especially children. Tell them that they are safe with him, but that he uses words and actions to his own advantage and often this is not good for others.
Remind them that you are always there for them, and that if they are unsure of anything, to come and ask you and you will always tell them the truth.
Then if they are on board, tell them that you are going to get a new number that he won't have, so that he can't hurt you anymore.
I found the truth not only set me free, it reduced the risk of being the one that broke the family up too. I was buggered if I went through all that I did, just for DS to think that it was me that pushed his 'perfect dad' away. I didn't want him growing up to think his dad was in any way a role model.
LeClerc, have you discussed this in your FP session? that's a great place to get ideas and approaches from too.