"essentially I think I'm looking for permission that it was 'bad enough' to leave"
Oh I get that! I think they wear you down so much over time that it does just becomes the new normal to you. But a little part of you, the original you knows it is not normal. That voice has been quietened and hushed up for so long, adapting to him, that when she decides to speak to you, you don't believe her anymore. So you start to question if perhaps you were the problem, maybe it wasn't so bad, maybe he will change, maybe this wasn't even abuse as he didn't hit me, maybe I am the abusive one or the one with mental health problems (as mine said)?
This is where it is helpful to speak to someone face to face that is skilled in this sort of abuse recovery.
For many a week my therapist would show me how it was abuse and I'd agree whilst I was there - it was all so clear. Then I'd go home and the questions and the wondering would start all over again! I had spent so long hearing that I was the problem that I couldn't see the wood for the trees!
This is all perfectly normal and necessary - a roller coaster of good and bad days, missing him, wondering, hoping, doubting - it is all part of your recovery so just go with it.
Sit up the garden with a cuppa and have a cry, feel it all - you are allowed to.
In the early days I was scared to cry - I felt like that if I started, I wouldn't stop and then what would I do - end up in a psychiatric unit or jumping off a bridge? But I discovered that I could cry and that the crying would stop - in fact, it made me feel better to have the cry.
I am not mental, depressed, over-sensitive, too emotional, passive aggressive, controlling and manipulative like he said I was - I WAS ABUSED.
There are still good and bad days, I still miss him now and then, I still worry about him, I still care about him - because I am a good person. You don't spend so many years with someone and then instantly hit the 'OFF' switch.
Sorry - I think I have sort of hijacked the post with how I felt/feel but I hope it helps to know that you are not alone, you are a normal kind and caring person that has to process what has happened.
Hugs x