Just go (semi) dark. Get on with you life, your stuff. Ignore H when he is in the driveway - or better yet, be going out the door all dressed up like you're going to a party when he is there. Don't call him, don't tow his car, don't take his temperature. Do plan for your future IF he doesn't snap out of it, but don't get sucked into discussing it with him. Send him a brief email letting him know when your appointments are, no requests or guilt, just the facts.
Give him some time to stew in his guilt. Give yourself the gift of some time spent focusing on something other than him. Work on some personal 180's that might make him curious about you. Ellie
