You know, any man who is physically violent towards a woman is basically a coward. Of the many occasions in the past I have dealt with cases similar to that which you are experiencing, so you are not someone alone.
The plain simple fact remains that you are displaying courage in standing up and giving evidence in the Crown Court against your ex for whatever reason it is which places him in the dock. It does seem that you have had (at some time) a loving relationship with this man in the past
and it is hard to dismiss him entirely from your mind. You have given yourself to him and that is no mean act which you can easily overcome or forget. It takes time, far longer than 9 weeks, and I might suggest that some professional counselling might help in the end, if you care to take that path. So, don't count yourself as being "someone on the outside looking in" - there is always help at hand somewhere...And do please remember - there are plenty of fish in the sea !
Ask yourself what it is that attracts you to this man at this stage. What is it that makes you feel a kind of regret over what has happened ? On reading your post it seems this man is nothing more than a no-good waster and you are better off without him !
Best wishes to you for a much happier future !