I appreciate the honest advice. I have completely processed these events, which were 5-6 years ago. I believe I can present this professionally and rationalize the role it's played. However, there are so many interview questions that could "trap me" into an unsatisfactory response. For instance, How did you let this go on so long? He was an incredibly intelligent and charming sociopath. *ding, ding* Victim card.
If I were to include this in my essay, which is a max of 2,500 words, should I be sure to not seem heated or emotional on the topic? I think my advantage would be to spin it as a learning experience, as gonnif mentioned.
What would be the right amount of detail? For instance, the physical assaults were progressively more severe, but I doubt they'd want detailed examples?