Hi and welcome to our group here. There are many of us here who can relate to your experience. We may have different situations but the emotional pull- how much to help while also protecting our own emotional well being is a common one. I have posted an article that describes this well:
https://slate.com/technology/2022/03/mentally-ill-parent-elder-care-boundaries-liz-scheier.htmlSince you were separated from your mother, it makes sense you would be longing for this wish for a mother- but also may not have formed a realistic view of the mother you do have. For many of us, even if we weren't separated from our mother, we still wish for that mother- the one we wish we have, and the one we hope to have if we are only "good enough" . Eventually though, we learn that the mother we do have is different from the one we wish for.
You don't have to go NC with your mother. I understand not wanting to. Although my BPD mother did not behave like the kind of mother I wished for, she still was my biological mother and I wanted to make the best of it. However, her emotional needs were huge and even if I were to be available to her 24/7, it would not have been enough.
As a recently married person- you want and should have, the family you have wished for - as your own family with your spouse. You will need to draw the line somewhere between meeting your mother's needs and taking care of your own needs and having the marriage you choose. Your mother may not be happy with this decision but your well being is important too.
Are you in the US? If you are, resources like Medicare/Medicaid cover some, not all, of your mother's needs. If you are in the US, I can describe these further. Even so, the system relies heavily on family members to care for an elderly person. As long as you are providing care, they will lean on you but being a 24/7 caretaker isn't sustainable in the long run.
Post your questions here (and your country so that people who are familiar with the resources can advise).