I need some support/advice through this

I have been in a very emotionally abusing relationship the past 2.5 years. We now live 4 hours away from my family because he got a great job opportunity. My family and friends (the ones I have left) do not know the extent of everything because at the time, I knew whatever they said still wouldn't change my mind and they wouldn't understand why I am staying, leading to turmoil. Well, I finally hit my absolute breaking point and starting looking for somewhere to live, he owns the house. TODAY, I got a notification that one of the places that I fell in love with accepted by application and would like for me to move in NEXT WEEK. I need this and I know this is the right decision, but I'm afraid I am going to back out and stay. And I cannot explain why, even to myself. We have not truly been happy and will go DAYS without talking. I think it is just the grief of physically losing him and the potential he had. I wanted to spend the rest of my life with him. And sadly, his dog is my best friend, which weighs ALOT on me. I just need some advice and/or pep talk to go through with it and make the move as smooth as possible. I have no one to talk to because my family does not know anything yet because I have caused so much stress in their life thus far and just want to be like "surprise, I moved out and everything is okay" and go from there with them. Also, I am not in any physical danger and when I tell him, I honestly don't think he will care. Its just me and my head.