He's going through court for one child.for abuse claims. Going through it twice for yours won't go in his favour.
This incident, this is the fire in your belly. Every moment you talk to him is emptying your emotional bucket. It's time you could be with present or happier with your DC. It's time you are choosing not to use for you and DC, who are far better off without him.
Je is failing at life and he will pull you and DC down with him.
The police have made clear that this incident is a make or break moment for you. Stay split up, stop unsupervised access (tbf I think you have grounds to stop all access but if you won't then you need a third party I.e. your sister to supervise) and the incident is on record and you have a clean sheet that you are acting in DC interest. This is your best chance for the life you're and DC deserve.
Every moment wasted on him is a moment you could spend with DC, resting, working on your confidence (and I know you have confidence issues because you've let him damage you but at the moment you have enough that you've been strong to split up). Basically fill your bucket. Choose positive stuff for you and dc over negativity with him.
You only get one chance to be a good mum and you do it one choice, one second, one minute at a time.
Good luck, because you might have years of this prick in your life and you'll need to choose to be strong every day from now on to give your child a better life than their dad will.