If Julian and Garak had a relationship on DS9, Julian would constantly go to Jadzia for advice. There’s just too much baggage and pain between them for him to not go to someone. She’s so experienced and he’s already opened up to her a lot via conversations and the medical school notebooks, so that candidness is super easy for him. She swears to keep it a secret, but occasionally speaks to Sisko privately about matters so Sisko knows that Julian’s okay. He occasionally passes fatherly advice through Jadzia about self-care and healthy habits and getting distance when fights get bad so lines aren’t crossed. Garak knows what’s going on but says nothing because they advice they give is actually helping their relationship and himself.