Ella,
I read this thread with interest as the struggles you have gone through mirror my own. I came out to my wife about my crossdressing three years ago and, to summarise, it all blew up in my face with the result that I agreed to cease all activities. The whole thing is now a taboo subject never to be discussed but, at the time, her feelings of disgust at my 'perversion' were matched, if not exceeded, by her feelings that she had been betrayed over 2 decades of marriage.
Obviously, what didn't go away were my feelings and, if anything, they have intensified and, at this point in time, I know that I should be discussing this with my wife but lack the courage to do so for fear that it will destroy our marriage. Whether I do continue to suffer in silence or finally pluck up the courage to talk about it again, I do not know but what I do know is that I wish that I had understood more about being transgender at the time I came out last time, specifically:
1. In all probability, it resulted from something happening to my brain during foetal development. It's not some dark perversion but almost certainly caused by over exposure to oestrogen in the womb
2. When we married, my TG urges, whilst they had been present from childhood, went away and I genuinely thought that I was rid of them.
3. Until I joined Susan's last year, I too felt that my TG urges were a perversion (and one that I was definitely not proud of) so did my best to keep them hidden
I hope that this will give you some inspiration for the talk with your wife. We are all rooting for you and I hope that you will soon find inner peace.