I would try LC..check in with him every now and then (like maybe every couple of weeks or month), be nonchalant, and ask how's he's doing, say you hope he's OK. Don't make it seem like it's a big deal that you are calling him. Then, allow him the space and time to determine when to call you back. And don't obsess if he doesn't call you back right away! If, he doesn't call you back within a reasonable amount of time (you determine that), then work even harder to keep yourself busy and to not get down on yourself if you don't hear from him... if you don't hear a reply from a platonic friend, do you get all bent out of shape?
good luck.. I broke NC with the guy I was dating and left a message for him yesterday.. haven't heard from him yet but any way this goes, I am ok with it... even if he doesn't call me ever again.