You didn't say where you'll be starting, but if it's St Jean, that's about 340 miles from Astorga. A lot can happen along the way over 340 miles, and you may find yourself ahead of schedule or behind schedule for your meet-up with your husband. If you're ahead of schedule, just relax in Astorga while you wait (or take some extra time in León, just three days before Astorga). If you're behind, catch a bus from wherever you are to Astorga. Then, you can just continue walking from there or, if you feel that you really want to complete the "whole" Camino, take a bus back to where you last were and continue walking from there. As a bonus, you'll get to see Astorga twice.
BTW, my wife and I walked the CF together and celebrated my 70th birthday in O'Cebreiro with a well-deserved rest day.