I sort of feel like you. When my (ex)wife n' I first became an 'item', back in 1987. I was happy. Over the next two years, prior to our getting engaged. She started 'messing' with the two other guys. She said she met on the county bus. finally gave her an ultimatum to choose between me n' the other two guys, She chose me.
While her parents' are ELCA Lutherans, there was a twisted dichotomy in her 'blended' family. She was older than her brother, step-sister, and step-brother. Yet she was treated like the 'Ugly Duckling' by her parents'.
After we got married(1992-2000), she didn't mess around with any other guys. We even went to church weekly. But the importance of being a Christian, and a Lutheran. Meant nothing to her.
She left me a week before her 30th birthday(and 4.75yrs. into the marriage) in 1997. For the next couple months, I was shattered. That was until, my (ex)wife told me that she had always wanted my (physical)health problems(that I have had all my life) to "just go away." It was then, that I decided to divorce her. I had to wait another another 3.75yrs. for it to be finalized. The day it was, I was relieved. My (ex)wife was the one balling her eyes' out.
15yrs. later, she finally admitted, what she had been denying for the past 28yrs., that she did have a disability.