Stockholm syndrome is caused by trauma.

Nonetheless, it's an experience. You still have that loss of feeling safe in a car now, it changes your experience even if it's a "light but traumatic" accident. There are different forms of trauma as well. You speak of physical trauma (damage). But there is emotional abuse, physical abuse, etc that can traumatize you and affect your character. It has repercussions. That's why things like Stockholm Syndrome exist.

Trauma is the experience of loss; that's why grieving is the process of overcoming that. Going through trauma, then being able to grieve is the process of building character.

You know the term "costs you and arm and leg". You can also equate it to this situation. The relationship is to costly and takes a part of you. This term came after WW2 where war was so costly soldiers came back with no limbs. I know the comparisons seems strange; but I do believe you lose a bit of yourself in these toxic relationships.

Trauma isn't for "weaklings", it's how you move past it and it can build character in one's self even though it's a painful experience. Everyone goes through trauma some point in there life.

Love can truely be a double edged sword. Not wanting to leave, and not wanting to live without, is an intense place to be. I am happy you were able to get out mostly "unharmed". I know some trauma may be there, but fellow human I am glad you are alive and now doing well.