I want to thank you for posting this.
I am stuck (at the moment) trying to decide what to do, after my partner of 10 years just told me he saw himself as gay (previously I always knew he was bi, and I was ok with that). He has had sex with me since, and adjusted the statement to "a little bit bi, but strongly gay" - this is a very sudden change from the past 10 years, during which time he hasn't bothered with men at all. I know for a fact he has met someone, I've heard enough statements that - when added together - present as evidence of this simple fact.
He still says I am his soulmate and that he doesn't want to have an emotional relationship with a man.
At the same time, he openly admits he "must be selfish" and that I can't expect regular sex with him anymore. He also talks about spending time away from me "just for him", which will be additional to the current time we already spend apart (he works in mining, so he's away for a week at a time, every second week).
I thought I was coping well holding the fort while he worked away, coping with being on my own, working from home (a decent government job, but I don't earn nearly as much as he does), keeping everything going, and having an absolutely awesome sex life when he was home. Now it seems, he is asking me to accept less time and less attention from him, with less intimacy, but he says "I'm still me" and "nothing's changed." Anything that I say, can and will be used against me, including statements such as "I love you".
Reading your story, there are so many similarities to what is going on here. It is extremely painful, more than words can say. But I understand that I must take steps to prepare for my exit, including sorting out the finances. My fiancee (he proposed only last December, back when life was so beautiful) said he would sign a prenup if it would make me more comfortable. Yes, well... it might not be a prenup that I draw up for us...