Grrrrr, the same BS that ex threw at me when he shacked up with his crazy gf and thought that anything I said about he kids feeling bad was exageration and that I was trying to get to him (our kids' therapist actually rolled her eyes and said 'oh phluease, he is so full of himself!) It was hard for a while, as my son was also not comfortable but I had to send them his way anyways (looking back I shouldn't have perhaps). Your case is slightly different, he already sees them the agreed time per the D, so if the kids are not feeling ok you dont' have to force them to go extra time... isn't the time he spends with them spelled out on the D? Just tell ex 'at this point son isn't ready, when he is I will let you know' if he starts spewing venom just tell him you are putting your son's feelings first and that he's just going to have to wait.
About the OW contacting you, double argh! ex's crazy woman would impersonate him and send infuriating texts to get me mad, but I caught it and put a stop to it. Next time the cow txts you tell her that you have all her txts saved and that one more of those will be considered harrasment and that you will be doing something about it legally... The exs turn into idiots when the ow is around and dont' think how one must be feeling...they are just pathetic insensitive loosers.
Just brush off whatever he says, if he wanted to see his kids often then he should've acted like a real man and kept his marriage vows, end of argument, his loss, you look out for the kids and you and no one else.
Be not afraid...I will repay you for the years the locusts have eaten Joel2
30something 2kids survivor of S, MLC, A, D I have peace in my heart, at last.