Closure is important. When I got divorced there were so many things I didn't understand about why my ex was doing what he did. While I didn't catch him in the act, he mentally left the family and didn't look back, but wouldn't help me to understand where the shift in feelings came from.
I probably would have taken him back if he had given me an opening, but I am glad in the end he didn't. I was more afraid of starting all over again than I was afraid of losing HIM.
Many years ago he had an incident in which he wound up in a motel room with a couple of hookers and a lot of coke. He drained our bank account that night. I 'forgave' him because I was scared, our kids were little, and I had no job.
But I never forgot. And it definitely impacted the rest of our marriage because I never truly trusted him again, even though I kept telling myself I was over it. If I had to do it all over again I would have left right then and there because my self esteem took a BEATING for the next 9 years.
It's so hard. Hugs.