Sorry I tried to find it, not really sure how go about searching for that thread, I do not recall the name of the thread or the Original Posters screen name. But I am positive this is the same exact story it is his ex fiancé Who posted. Sorry I could not be more of help.
Google lets you find anything.
If it is, man it's sad. I think it is, so I also want to change my advice. If this woman is telling the truth is sound like she was abused from a very young age and taken advantage of by a sick man. Also sounds like this sick man is still trying to abuse her. This changes the story from what sounded like a very adventurous girl in collage who basically kept it quiet, to a sexual abused girl who was pressured into doing things she didn't want by an abusive boyfriend. I get it she didn't tell you. That was her mistake and wrong, but I don't think it was a lie of malice but a lie of shame. Even though the lie was wrong, the motive for the lie was not one of evil.
OP do you love this girl? If you do then it may be worth fighting your feelings when it comes to her past. Only you know her for who she is now and you know better if she is telling the truth here in this post or not. If you think she is I think you guys should start over. I think you should give her a second chance, but let her know that honesty is needed moving forward, and this is part of the test. I am not saying be cautious, I am say be very cautious but it may be worth it.
Also you both should see if you can take some legal actions against the ex. What he did is illegal, and he may try to do it again
One more thing, in a way this ex-boyfriend is abusing you. And you are kind of letting him do it. He wanted to use this thing to destroy a good thing you had in your life. I don't know but if it me, that would make me pissed. I mean F this guy. Why does this garbage get to define who your ex gets to be with and what her worth is. You had a good thing going before this right? He is still manipulating her life and you with it. With out knowing it you kind of let him do it and abuse you too.
Finally this may all be an elaborate ruse and is so I will be the sucker and play along. If it's not and you and this women are real, you owe it to yourself and her to read everyone of her posts. Post that she had no reason to lie in because she never even told you about them, and from your words here you had no idea.
It will take counseling but if this is true you love the kid, and you loved her. I say a good man would fight, fight the thoughts, fight the evil ex boyfriend, and fight for what should be his family. Sh!t this story makes me want do drive to Canada and kick the ex's @ss all the way to Mexico. It would also make me want to fight for her because she need for someone to fight for her once in her life. Is that person you OP?