I would like to see you both receive some professional counseling during this very troubling time, both individually and as a twosome. It's a wise person who knows she/he needs help to recover from the emotional trauma that you have both suffered. Even if you were both being comforted and supported by family members and friends, I would recommend therapy at this time.
You may feel distant from your friends because they don't really know how to respond to your family situation and to how depressed you are. Many times, even our best friends withdraw from us during troubled times because they are unsure of what to do or what to say to us. I t doesn't mean that they have deserted you. It might mean that they need to hear what they can do to help. As difficult as it may be for you to come right out and say what you'd like them to do for you, I would make a big effort to ask them for what you need, even if it's just a sympathetic listener.
It has to be tough for you, under the best of circumstances, to maintain this long distance relationship. I would continue to keep up the relationship as best as you can, hoping that if it has a good foundation he will understand what you are going through and be a good friend to you as you begin to get better. As for convincing your dad to move away with you and start fresh somewhere else, I don't know if that's possible, given his job and your family's finances. I do know we can't outrun the hurt we feel inside by moving away -- it follows you. So, while getting a new start somewhere else is certainly something to consider, after comparing all the pros and cons of such a move, I would not place a lot of hope on the move alone relieving your hurt, confusion and sadness.
Please get the professional help that you need right now and ask an adult you know who's close to your dad to encourage him to do the same. Even though your world looks bleak now, you will recover and know happiness and optimism again, but you have to move through the pain to begin the healing. Let me know how you are doing. I'm pulling for you.