Hi, and thanks for having me.
I'm a cisgender man in my forties, happily married to my -currently- wife since eight years. (Aside: I'm going to use she/her pronouns here, as it is still how she wishes to be addressed). She's the same age as me and we have three boys from previous marriages.
A few days ago (and since), we've had (a) long conversation(s) where she opened up to me about how she is, since a few weeks/months, questioning her gender. I did not see that coming, but there were signs. She presents quite feminine, but does not like a lot to perform femininity: she's often dressed in pants and a sweater, or not-very-gendered clothes, sometimes a long dress in summer; she hates g-strings, does not wear bras, etc.
We have a very healthy relationship and define ourselves as best friends in addition to very-much-in-love, and I'm very glad she felt safe enough to tell me about what she's going through so soon in the process. So, we talked a lot about what this means for her, for me, and for us, and so far, while we're of course, full of questions, we're optimistic about the future of our relationship.
I have so far defined myself as heterosexual as I only had heterosexual relations so far, and I have never fallen in love with a man, but I have been known to find some men hot and sexually attractive (a sentiment I share with her), and we've been having "gender-non-restrictive" sex since years using toys, so I'm not too worried about that. (I'm also not very intent on my masculinity in public, having long hair, often painted nails, and often being misgendered on the phone without being bothered by that).
I guess the thing that may be the hardest if/when she fully transitions would be never to see her body in its current form anymore, as I find her beautiful and hot; but I've tried to imagine and I imagine that she would be a very attractive man. Possibly more than Cillian Murphy ;-)
Even though it's been years that she has sometimes thought she'd have preferred being a boy, she's at the very start of a path and she doesn't know at all where it will lead - to non-binary, more androgynous, to taking hormones, to top surgery, all or some of the above, etc.
She also has been very reassuring in telling me that "If [she's] a man, [she's] definitely gay", so I am not worried this could lead to a divorce caused by my own gender.
So far, all of this has my brain thinking a lot but not in an horrible, "we'll never survive this" mode, more like "life's full of surprises and I can't wait to see where we'll be in a few years". Of course her brain is even more full of questions, so I'm trying very hard to not make it all about me, which is why I'm here now. So I can, if necessary, share my other people in my position. I don't want her to have to handle my own questions and insecurities more than necessary.
What I'm sure of is that I love this person with all of my heart, and want to be there, and don't want to be a burden, and above NOT be the reason she forbids herself to do what she needs to do.
This past week, I've seen her smile more this week than in a very long time, (and we've also been very horny); and I think that it means something.
Thanks for reading me!