Are you happier today in a different job? That's what matters
obstructiveThoughts
This reminds me of when I was a kid. My school computer were running slow as heck windows xps or windows 7s, mostly slow because the bloat of education software that was installed to block visiting certain websites, lock down computers during certain hours or when the teacher is lecturing, etc. Even in my high school.
One day for my computer class during a lecture, I plugged in my liveboot USB running Mint, hushed my classmates next to me and rebooted. I didn't expect the computer to make a loud as hell beep sound when it got to the bootloader, but I was sitting in a side row so the teacher just said "what was that?" and moved on while others looked at me suspiciously. But then I was able to boot up Linux right there, super easy. And everything works, I was able to browse the web without any restrictions, well I'm not really trying to look at bad stuff but just hate being locked down when I can do something else instead. Or maybe I just wanted to show off Linux. Anyways my classmates next to me silently whispered "what the heck how did you do this??" I look back at this as a fond memory.
There is a line between acknowledging the horrible reality, and being completely submerged in that and can't see the flowers next to the dirt road, and can't see the light at the end of the tunnel. I have a similar tendency as you described, but with my partner I'm able to notice that a bit of positivity I lack is essential to survive every day. A lot of people have traumatic pasts but move forward by seeing the hope in the hopeless, enjoying the simple things in life when they have the means to do so. I would say becoming positive and hopeful should be a prerequisite to getting into a relationship, otherwise you only have a shaky foundation and both of you will fall over.
Good job for standing your ground and drawing boundaries. I have similar problems but a few years ago I did just that. A lot of anguish and strong emotions went through me as my mother went mad and extremely angry with my choice. This hard decision will pay off, stay strong. I had a friend recommending this book "The Body Keeps the Score". Never got a chance to read it but it could be helpful.