Keeping secrets is not your strong suit. You enjoy communicating, informing people, so how can you keep something juicy under a lid? For you, it’s not gossiping – just sharing the news, so why not let the world know?
There is a way to confide in Gemini and be sure that no one else will know the secret – to make them swear to secrecy. Gemini is true to their word once they’ve given one. But keeping mum is not in their nature, so they’d prefer not to know the secret rather than be made to keep it.