Losing your husband because he comes out as trans is no different than losing your husband because he comes out as gay but no one would dream of talking about how the gays have stolen their husband.
I want to pick up on this.
No its not the same.
The guilt trip that it's 'just the same as being gay' comes from a position of extreme ignorance.
For a long time, I struggled with this idea. I wanted to believe it, but in practice it just wasn't the same.
If you are presenting physically in a different way, by pretending to be a woman this is hugely different and psychologically incredibly difficult to cope with.
'Being a woman' raises huge questions about a wife's (or sibling's in my case) own sense of self and worth.
For me it included this sense of competition and questions about how I appeared to the world. Did their understanding of what a woman was come from me? Then there's the hyper sexualisation of the presentation. Having a brother who was now a 'sister', felt like looking into a twisted mirror. I can imagine there is a similar sense for trans widows though without the family resemblance (but is applicable to their children).
It's also not just the physical side of it, but all the stuff about changing name and the expectation that you treat someone differently based on sexist stereotypes.
If you come out as gay, this is not something that is part of the process.
It's this gaslighting that makes it a different beast that goes further and deeper than any sense of betrayal and being lied to about their sexuality.
I very much resent the 'its just like being gay' comparisons. I found them harmful and it made everything worse for me because of the emotional blackmail that was laced into the comment. I find it grossly offensive and very belittling to women affected by this directly.