Hi ~ The word "past" means: gone by, ended, over. That came out of the dictionary.
So HER past is gone by, ended, over -- and that's how YOU should think of it. It doesn't mean anything to her anymore. Put it OUT of your mind. Write it on a piece of paper and bury it in the back yard if you have to. That works for some people, believe it or not.
You cannot start a new, healthy marriage if you're going to obsess over her past. And if you can't let it go, then let HER go so she can find someone who won't judge her by her past -- and that's just what you're doing. You're JUDGING her. Her past has NO significance on the here and now. So why are you concerned about it? Like I said, if you can't let it go, then let HER go.
I wish you the very best. God bless and take care. Hugs, Lee