I think delaying getting his stuff out is all part of his game, sadly. If he really wanted to cut ties he’d have either taken it or abandoned it in your apartment by now. Do you know where he’s currently living? If so you might want to look into arranging getting it shifted to the new place and be DONE! Apologies if this idea isn’t an option, though, but I know other people in your shoes have got so fed up they did it. Hell, if I lived anywhere nearby I’d be hiring a van and moving his crap for you. I might not even care if I didn’t have an address to dump it lol.