Hi OP. I'm so sorry you're in so much pain. Hearing you so down on yourself, like you don't deserve anything good and can't understand why anyone would stay with you, is heartbreaking.
I wanted to share my own story in case there's any parallels. I've also got CPTSD. I've been VLC with family, that may well become NC too. I also got married recently. It's triggered a lot of emotional turmoil.
I've survived a lot, but I'm also completely unused to being truly loved and seen, and being someone's priority. While it has enabled a lot of healing for me; the act of being legally married now has also triggered a lot of depression, flashbacks of past trauma, a lot of my low self-esteem coming to the fore. Sometimes I resent my DH for being so attentive and caring towards me, when I just want to withdraw and hide. I want to slink off like a wounded animal and lick my wounds and just be left to wither away in peace. Because withdrawing and hiding and having no expectations of anyone and blaming myself for EVERYTHING - was how I survived my emotionally abusive family. It was safe for everyone - I didn't get hurt by anyone, and they got to just call me "independent" and get on with their lives.
I've also had a good degree of professional success, but was forced to quit my most recent job due to stress and now we're dealing with fertility issues too. So...there's a lot of pain. And my usual coping strategy of blaming myself for everything, I'm a terrible person who brings nothing to the table, I can't even bring an income to the table now, or give this man a child, etc...they're trying so hard to kick in. So, so hard. I have to fight every day to correct my thoughts, connect with my body and remind myself that I am safe now, I don't have to "not matter" anymore. I get to matter now. I get to listen to and believe my own feelings. I get to grieve for the family I never had, and feel heartbroken about my current circumstances, and then build my new life from there.
It's really, really hard to cultivate good things for yourself when you come from family dysfunction and were never allowed to see yourself as good, worthy. It's very triggering too. A very young and hurt part of me always fights it, because it scares me stiff. That young part of me just wants to rot, wants to be left alone, wants to give up on it all. I'm trying now to get to know that young part of myself, because she's really just a scared child that was never comforted. She never learned that these are just feelings, and feelings aren't everything. Feelings will pass, if you sit with them and allow them to move through you.
Things that help me now: moving my body every day. Walking, yoga, somatic movement, sea swimming, even walking on a treadmill in the gym for an hour. It brings me out of my scary past and into the present, where I'm a 38 YO woman in a safe life now. What does 38 yo me want to achieve today?
Also, journalling, lots of journalling. I wake up in fear and confusion almost every day. Again, when you have childhood trauma - very normal. Mornings weren't fun, light or easy. Getting up for another day of pain was terrifying. So I try to wake up and write all those feelings down, it feels almost like a purge, and then I walk the dog and go on with my day.
Sorry this is so long. I just wanted to say to you - as someone who understands you, and has read through all your posts - my initial thought was how far you've already come. You had that hard awakening that most people can't face. You went NC. You had your own family. You achieved professional success. You sought a healthier life, you trusted that you could find true love. You've come so far and done so much of the hard work already! I feel like it's just a continuation of rewiring of your brain that will help you here.
I wish you the best of luck x