Do you know the reason why he stopped replying? Finding that out might be your first step, because dealing with their arrival is not going to go well until you have some closure as to what happened. If you still have feelings, it might be best to lay all the cards out so things are open from the start. He might feel the same way and then you can move towards resolution. And if he doesn't, then you will have the closure to move on and handle his presence with grace.