So, is he "working this hard" because he thinks there is still the possibility of a future with you? Are you going to attend therapy with him? If you told him there is no possibility of a reconciliation, do you think he would continue to work so hard? It's really none of my business, but if you are absolutely sure you will not reconcile with him, I think you should tell him that. It just seems like you are leading him on a bit. I may be wrong, but that's just how it comes across to me.