CTH, I think it is healthy to think about the family and reflect on special moments that happened in the past. It hurts now but in the not to distant future it will make you smile. However, do not dwell on them now. Your W is as much to blame for the situation as you are. Do not second guess yourself. You are here, you want to fight for the M and the family. In my book that says a lot about your character.
I keep telling myself to focus on me, not the W or the broken M. What kind of person do I want to be? How do I accomplish that?
Like me, you need to turn the page, but we need to do so for the right reasons and within the right time frame. This is something I am still working on.
Your W is not erasing you from her memories, she is just creating new ones. That is your job as well.