I just wanted to check in and see how you are doing.
Maybe your H hasn't filed for D because he isn't completely sure. Or maybe he thinks he can push you to do it...which may relieve some of his guilt. If you are not ready for it then don't do it and don't push him to do it. As much as my H had talked about filing for D, I still wasn't prepared for it when I found out he had. I know it is frustrating being in limbo though. Like I said, only you can decide how long you want to wait. I would also think about what you would do if he did want to come back. What would you require of him? How would you get past all of the damage that has been done? ...Just some things to think about.
As for your dad...he means well and doesn't like seeing you hurting. I don't think you are letting him screw up your life. You are still in school and doing great. You have to do what you want to do...not what other people want you to do or think you should do. No one knows how they would react until they walk in your shoes.