After you quit a job, your first reaction might be to put that chapter behind you, move on, and forget everyone who was a part of it. While that’s understandable, especially if it was a painful experience, you might want to reconsider putting the whole thing out of your mind.
There are some excellent reasons for staying in touch with your former co-workers. After all, one of them might get hired at a company you’ve always hoped to work for and could refer you to the next opening.