
My dd turns 18 soon. In the last year I have seen her start to stand up to her dad when he does things that bother her. She never used to do that because she was afraid of the confrontation. She saw him rarely, he is military but that is only part of the reason. Lots of times he would post pictures on some social media of a vacation when he cancelled visitation with the kids citing some other reason. I just recently heard her tell her brother that she will be glad when she can tell her dad that he isn't a priority cuz he never made her one but can't yet because she knows I will be upset with her if she is rude! So, in a way, eventually she is seeing who her dad REALLY is and finding out who she REALLY is and what she is willing to accept in her life. That is part of growing up, figuring out the parts that we can accept and not accept.
I am sorry that your ds is having physical issues with the stress of it all. But, in the end, remember to love him a little more. I understand what you are saying about vacations etc, but there is only the two of you. Dad has a whole new family and really your ds's input should have been sought. I think I would discuss with ds that he should continue to keep the lines open. Its a work in progress. It sounds like ds is having a hard time on many fronts with this situation. Just guide him, talk with him, support him. What dad thinks or who he thinks is the problem is not even part of the equation. IMHO the only thing that matters in these situations is making sure that my children are able to have healthy relationships knowing their personal boundaries, with whoever it is.
Kelly