Everyone here is giving you great advice. 25 is referring to backing off on texting/communicating because it seems that is more for YOU than for them.
But don't back off on getting your son into the program the school suggested. Doing NOTHING is far worse in this situation. Worrying about how your daughter feels about it is absolutely no excuse to DO NOTHING.
By doing NOTHING - you are condoning your son's behaviour even if you don't agree with it. If he were my son - I'd go over there and haul his ass straight into the school and arrange the program from there. I would take ACTION.
You can disagree and write on here till the cows come home but if you don't take action - who will? Obviously not your ex.
And seriously - when I said that your words and actions don't match - I am talking about telling your wife you wish her love again. Then agonize over the new guy and how he is sleeping over etc. That makes the words seem insincere. I can honestly say that I'm not wishing my ex and maggot "love". I just don't care any more but I won't go that far.
But anyway - I post because of your children. To continue to tell us about it but do nothing is what is so frustrating. No - we are not there but then - you are. And you are the one who needs to step in and take ACTION. NOW!