I too want to commend you, STP, for receiving all input in the spirit of support (not criticism) it is intended. We are all human, and this shared experience has changed our approach to relationships. If it didn't, we'd be crazy! And we are most of us single people now, even if we didn't want to be. We have the right to define 'commitment' and relationships however we see fit, but I agree with others that you and your partner should at least be on the same page with that definition. And that comes with the vulnerability and accountability that so many of us fear in new relationships.
I remember your BD very well. It was particularly cruel. I think you've grown a lot in your ability to overcome resentment toward her and focus on yourself, your life, having fun, and being social. But there is probably still a wall there when it comes to not wanting to ever feel that level of pain again, and maybe sabotaging something good in order to keep yourself from going deeper. There's nothing wrong with having a relationship that allows you each to have space; but you can't fill all the extra space with other people. It doesn't leave room for yourself and your growth. Maybe, and this is just my opinion, if you took time to work through these vulnerable places that are still afraid of what might happen if you love too much, that fear will start to neutralize a bit. I did a stint of work with a "resilience coach" this year and through meditation and mindfulness, I've peeled back more layers of this trauma and feel so much more prepared for future relationships because the one with myself improved. That was just my way (not saying it should be yours), but even this far down the line after BD, it helped. I feel even more independent, and ironically, I think that will eventually make me a better partner.
I hope you and KA get back on the same page. If you don't, I hope you have amicable peace with it and are able to appreciate how much this relationship has helped you both grow.