Hi gravity1,
His mother depends on him emotionally, and stays home all day long. He constantly contacts her during the day and becomes very upset if he won't answer her, even if he is genuinely working. He has been able to communicate the huge amount of anger he has towards her and I felt this to be a huge step. He has had to be his mothers emotional partner his entire life, and she will even come down for the weekend and stay with him at times. This has created a VERY tough template for me to work with, because whenever I contact him during the day he feels incredibly triggered, overwhelmed, and engulfed. I am a nanny so I am home with a child all day, and I do feel like he feels like the same thing is happening even when I just want to know how he is doing.
we are often not only struggling with behavioral problems of our SO but with a whole ongoing legacy of behavioral problems in SO's FOO. You situation sounds tough indeed. He has insufficient boundaries and gets dumped on by his mother. And then of course the coping capabilities are stretched - considering how much he may be dumped on by his mother probably even healthy people would be struggling to stay calm. In the medium term he would greatly benefit from learning to establish boundaries but it is very difficult to do that from your vantage point as that may pit you against his mother. A T from the outside could really help him there.
Right now how to communicate - avoid invalidation and validate, validate, validate, validate and validate. In a healthy relationship the ratio of invalidating to validating exchanges is 1:5 or better. Validation connects in a healthy manner and it helps him to process his emotions. Validation is not problem solving - leave the problems with him - just listen carefully and give back your best understanding of how he feels and what the situation looks from his perspective. And once in a while you can slip in your perspective in a neutral manner for his consideration without pushing it. Your main activity howrver
is not to fix but simply to listen carefully and actively respecting his point of view... . Have you watched this video?
https://bpdfamily.com/message_board/index.php?topic=206132.0