I have Blaire and Julian and Phoebe and theyre my favorite villagers, I honestly do not want them to move, they won't move if I talk to them everyday right?
They'll never move out without telling you. But if you don't talk to them, they'll leave without telling you so that's why people think they leave. But not if you talk to them everyday.
They should always notify you. The only reason they may leave without saying anything is if you TT'ed past their move date either forwards or backwards without speaking to them within five days of their moving date.