Pardon my sort-of (actually? I've forgotten. It's a related language, anyhow) French.
... If you're going to leave the site... leave it without announcement, with no (or vanishingly little sound and fury and complaint about those eeeeeeebil Admins and others) before you decide to (surprise!!!!!!!!!!!!!) come back
or - leave it with announcement and don't come back. (and if you come back, avoid me. I can't stand liars.)