The fact he has plead guilty would suggest he is appearing at court for sentencing (subject to background reports). This would mean you do not need to give evidence against him.
What he pled guilty to would have been formally read out in court, on his appearance, which I would have suspected would have been from custody this being a domestic assault.
What happens with regard to the sentencing very much depends on his background! i.e. Does he have previous convictions for crimes of violence, Domestic abuse etc.
Domestic abuse is not looked on lightly by the courts.
Do you want him back?
If not and he harasses you I would report that with a view to obtaining an interdict against him with a power of arrest.