Most guys would gladly give back something like this...a breakup is a breakup...right? Is the an alcoholic response or just an unrelated guy thing?
there is no rule book on how anyone is SUPPOSED to behave post-break up. not everything is a guy thing, or an alcoholic thing....sometimes it's just a thing, in the moment.
since you plan to extirpate any items you have, what does it matter what he chooses to do? let it go, let him do him. you can still symbolically end your participation!!