Since this sounds like something you want to stop, perhaps exploring this with a therapist would benefit you. Discovering the root of the issue and maybe even how to stop it, is something they could help you with.

That being said, what makes you think the 20 year abusive relationship is the cause to your hypersexuality? If you want to share of course, answering the question might involve disclosing personal details. So i'd understand not wanting to.