The practical details of closure are part of treating the relationship with respect.

Endings tend to be handled emotionally and left unhandled practically. The keys, the shared account, the borrowed books, the message telling people: these feel small next to the feeling, and they keep the thing alive for months. Every loose end is a reason for contact that neither person chose. Attending to them is not coldness; it is what allows the ending to actually end.

If something has closed, make a short list of what is still tangled and work through it plainly. Do it in one go rather than in a series of contacts. Being plain here is a way of being kind.