Dear J.,
Since you are not “allowed” to communicate with the current girlfriend and I doubt that your former husband related this story, somehow I can’t visualize your 16-year-old son snuggled up on the bed with his sister and the girlfriend, (that would be a whole other problem to address.); I’m guessing that you got the information from your 6 year old?
Your former husband may be well respected in his field, but most likely lacks self-esteem and rightfully so after leaving a pregnant wife and abandoning his family. You say he left the first girlfriend. Are you sure she didn’t dump him once she figured out what an immature, lowlife he can be?
I predict the current relationship will also end and he will move on to the next unsuspecting female. Your former husband sounds like a “piece of work” and you are well rid of him!
The reason he doesn’t want any contact between you and his current girlfriend is that he is “afraid” that the two of you will compare notes and he will be exposed.
Your job is to see that your children are well taken care of at all times. Any 53 year old man or woman who throws “temper tantrums” when they don’t get what they want from a 6 year old child, needs to be monitored and supervised just like a child and could probably use some family counseling and anger management.
He could do this willingly or you could probably have it court ordered if he wants continued visitation.
Don’t mean to be “preaching to the choir” since you’re in field of counseling, but I think this might do you some good as well. You still sound very hurt and angry (with every right), except it’s not good for your spirit to hold on to hurt and anger.
It’s time for you to take control and let your former husband know he’s not in charge. You have every right to communicate with the woman your children spend 15-20% of their time with.
Blessings……