Strange things happen in court, if this even makes it to court. He could plea down to a lesser charge and not have to serve any jail time at all. Part of a prosecutor's job is to get plea bargains since courts are so backlogged. I'm sure his attorney will encourage a plea bargain, too. I know what a big deal this is to you, but these things happen all the time and it's just another day at the office for attorneys and prosecutors.
I said all that in order to say this...do not have ANY contact with either of them. You are in a very dangerous position, so do whatever is necessary to keep yourself safe. It's going to take a while for this all to come to a head, whether it gets to court or not, so anything can happen between now and then. Keep your guard up, change your locks if you haven't already. Check into a security alarm if you don't have one, be cautious when you are out and about. You have no idea what they may try to do, especially if they are under the influence.