People change....period. He changed and decided not to take you as a passenger during his journey to change. My STBX changed as well. She is NOT the same person I fell in love with, and when I look at it that way, I can stand back and be reflective and clinical about it.
That being said, the whole process blows a huge hole in us: who we are, how we once defined ourself, our own sense of worth and self esteem, the total betrayal by someone you once trusted implicitly. Only time can take care of that, and for some of us, a LOT of time.
You are a smart, reflective woman who will get through this. You, like me, take your cynicism with you wherever you go! Sometimes "black humor is the best". One of my good friends in Iraq who spent most of his days on the roads once said to me in November of 2007: "I think I'll hold off on Christmas cards this year!"