Wow, what a beautiful and heartfelt post. I hear you (over and over!) that to be true to oneself ("selfish" is a loaded pejorative) isn't "necessarily" wrong. I feel myself wondering if you're feeling defensive. I can well understand that, believe me. I'm glad if your blog post has provided you with a way to get your thoughts together, written down and organized, and presented.
My ex-wife was also very alarmed and upset as I came out to her as trans. She said I'd betrayed her, as if I'd had a secret affair. I went through a lot of guilt and sorrow (as did she) as we considered ways of remaining together, decided that we could not, divorced, and then separated.
I have this on my kitchen wall, framed:
"Life is too short to wake up in the morning with regrets. So love the people who treat you right, forgive the ones who don't and believe everything happens for a reason. If you get the chance take it. If it changes your life, let it. Nobody says it would be easy, they just promised it would be worth it."
--- Dr. Seuss
I look forward to hearing more from you.