I am very sorry for what you are going through. I know that you have mentally expected something like that will happen. But when it happens, it really hits you.
But remember Michele's book, S does not mean D. Sometimes two of you need to S for awhile to find out the real feeling to each other. IMHO, give the best impression to your H before you go dark on him. Use the LRT. He shows a positive response to S, and not D. May be he needs to sort out his true feeling alone. Maybe after S, he finds out that he really misses you.
In the mean time, live your life the the fullest. Be happy. It does not matter whether your H comes back or not. You must be happy yourself. If your H comes back, it is an icing in the cake. If not, you move on with your life.
We are here to comfort you. May God bless you with peace. I will keep you in my prayer. Big hugs from me.