Tough love will not work in this situation. When you are having conversations w/him about moving back, you are putting far too much pressure on him. He's not ready to come back, he's given you the excuse of having time alone, etc. When this man is ready to move back in, there will be no excuses given.
Impatience will be the downfall of such situations....this is the hardest part of your journey....you want him home now and yet, he's almost there, but not quite. Give him the time he needs if you really want him to return...What's 3-6 more months? You've been flying solo this long, can you continue to move forward and live your life w/o him being under the same roof for a few more months? Many, many people become so impatient at this time and screw up their chances of reconciling, i.e., they opt to file and get on w/their lives or they continue to push and the Mlcer will dig their heels in deeper and stay right where they are at, thus, a longer time in the over, so to speak.
Tough love does not work for the MLCer.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.