Hi, I am in sort of a similar situation as you. I am a straight man, married to a woman exploring transitioning. She has recently told me of her desire, she has been going to therapy for apparently over 2 months now, before she even confronted me. She is not comfortable including me in her sessions, at last not yet, but she did recommend I search and learn all I can either online, or seek out my own therapist.
She assured me she is and has always been attracted to me and has no plans to change that.
I am in total shock, even though there have been clues over the last couple years, I wouldn't have ever guessed this.
We have been in a female led relationship, which is something I introduced to her before we were married. I can't help but think, I might have led her to this. Our relationship started out fairly vanilla, but after I introduced a FLR to her, she found it suited her well. For me, everything became about her and pleasing and being supportive of her, she was free to be herself, which led to increased confidence, assertiveness, and leadership not only in our personal relationship, but in every thing else in her life. I love the feeling of being the supportive one.
She had always been a bit of a tomboy, but always cleaned up well and looked very beautiful, but over the last few years, she gained a lot of weight, started wearing little or no make up, wearing less feminine clothes, and started going longer between shaving her body hair, till she finally stopped last fall. This spring, she came home with a new super short haircut, and shocked me. Then on the first warm day this summer, she decided we were going to town, and she was wearing shorts and a tank top. I asked her if she was going to shave, and she got mad and said "no, are you?" I said no, and she said "then why should I?". I was puzzled, but I didn't want to say anymore, because I could tell it irritated her. So off we went. I felt humiliated the second we got out of the car. There were kids right off the bat who saw her legs, and laughed. We got in the mall, and the occasional stare was all around, I could hear whispers and comments all around. I just went numb and pretended I didn't hear anything. All the while, she seemed to ignore it like it wasn't happening. Her attitude was great and it was like she felt very comfortable. I remember how strange it seemed to me.
So pretty much all summer, where ever we went, it as the same thing, I guess I got used to it a bit, and she began to have some witty comments she would say back to people, depending on her mood.
Well, then came the day she told me of her desire to transition! I had never been so floored! I asked if it had anything to do with me suggesting the FLR years ago. She told me no, that she had known this since she was a child.
So, that's where I am now. Confused, dazed. I don't know what to expect, what if she wants to take hormones, or have surgery, what will my role be, hers, what do I call her, when do I call her a him. What will my parents think, what changes will she go through, what will sex be like, would we ever be able to have kids, so many questions!