Your parents problems are
never your fault, even if you may have encouraged things to progress to him moving out. It was going to happen anyway if things were bad enough to get to this point.
It's ok. Life does go on.
This is just the beginning of a new way to live. Take things one day at a time. This won't be as bad and weird as it seems right now.
As for your family, family is what you make it. I adopted my friends families long ago as mine so I have a few families.
Family is more than blood.
If you want to keep eveyone together, you can be the one to do it but don't kill yourself doing it. Just keep your door open to them.
When my parents broke up, I was glad to see them have a chance of moving on. Life is about being happy and doing the best you can. Sometimes things don't work out and you have to move on.
Often times, people stay together just for the kids and it kills everyone that way. Moving on is awkward but you will be ok. They will be ok. It just takes a little while to get used to the new arrangement.
Your job now is to keep on keeping on and get good grades. Make them proud and happy that way.
In a year or so, maybe you can move in with him. I stayed with my dad and life was good for me that way. I would have gone insane with my mom. I hope he can get a place where you can move in. We need our fathers.