Possibly. I wonder if you mean "convicted" rather than "arrested"?
- There is no way that he will be "arrested" because you don't accompany him ("arrested" is when he taken by the police before a trial).
- On the other hand, if he plans to call you as a witness for the defence, then your absence may mean he is convicted at his trial when otherwise he would be found innocent.
- The final possibility is that you might act as a character witness after conviction, and your absence may mean he is sent to jail rather than fined.
It may be possible for you to write a witness statement describing what happened, and to have this notarized. On the other hand, the prosecution may well want to cross examine you.
I am pretty sure you can write a character witness statement (saying, if true, that it's a first offence and that you have forgiven him, etc) and get it notarized. That might persuade a court to be lenient.
I think you (as a couple) need to talk to his lawyer.