I have some sympathy for the man in question, the same as I have for any other addict (drink, drugs, gambling etc), it's a conscience decision to go down that path, but then it takes over. And like other addicts family members etc are victims of the behaviour.
Unfortunately the selfish behaviour comes from society that doesn't treat it as an addiction but rather an LGBT+ rights issue that treats everyone else as bigots. He's a victim because society won't say what he's really dealing with, but rather pretend that it is "gender identity". He's also a victim of medical malpractice, anorexics aren't given gastric bypasses, so why do these men get "gender affirming" treatment?
There should be treatment, like there is for gambling addiction, and how to get men off of this behaviour. A gambling addict isn't given affirming treatment (such as taxpayer money for more gambling).
It is an addiction, treat it as such and treat families as you would treat families of addicts.