I agree with everyone else - you need to tee up sessions with someone again and to tell your DP.
It is not your responsibility to keep that disgusting creature's secret. Once people who knew you then know what happened you might even find that they had an inkling all along and just needed you to say something - most people find that someone was already onto it and powerless to do anything to help.
I don't expect for anyone to 'get past' this kind of thing in such a short time frame, and it definitely sounds like post-traumatic stress manifesting itself. PTS is a bit like a grenade left around without the pin - you don't know when it will be triggered.
A mental health plan from your GP will help enormously. Go easy on yourself - you survived something that many women with men not even half as regularly violent as this don't walk away from
You are a survivor