Dior, haven't had time to read the whole thread but just wanted to send you some hugs and tell you that I am going through some issues with my mum atm and though I have clearly had a lot more love and support from mine over recent years than you have, she made some really bad decisions when we were younger, which I have confronted her about and she always gets defensive and tries to push it back on me. We are not speaking atm as a result.
I therefore envy you in a way that your mum has accepted it's her fault and is not trying to blame you (how could it be your fault? - you were a little girl and, I suspect, a very sweet and loveable little girl at that) and you will be able to move on because of her admission. But I can understand how bereft her admission must also have left you feeling.
Sounds like you have a great DH and maybe all of this will go towards helping your relationship with him. Try and just go with the pain and loneliness, honey, and be a friend to yourself and remember there are lots of people here who feel for you and care.
xx