You can not reassure your H that the "feelings will return. They are his feelings.
What you can do is allow him the space and the time to develop them. Let him know that you accept him while he is in this transistional period. Let him know that you will stand by him whether or not he EVER gets those feelings back. Once your pressures are removed he will be free to come back, to express his love and feel it. Now he feels everything is ackward and forced. Given some time and NO pressure it will start to come naturally.
SS, take that leap and accept the worst that yes the feelings may never return, Once you face that square in the face and deal with the consequence you will be free to make the choice. To choose a journey that says that if you are to rebuild your marriage you will cast away your doubts of what it will take to do it and act as if only the result you want is possible.
