I am so glad for you that you are no longer with that abusive ex.
My partner's ex was similarly abusive. During our first "fight" which was really more of a heavy discussion, when he expressed how he was feeling, I thanked him for trusting me enough to share, and did my best to validate his feelings, and explain mine; he thanked me for not throwing it in his face or telling him he was being too sensitive.
The effects of abuse linger long after the relationship ends.