You shouldn't spread rumors about others.
Sarah hears a rumor that her friend is secretly gay and afraid to come out.
Sarah wants to know her friend's sexuality.
Sarah approaches her friend and tells him directly that she is an ally and open to talking without judgment.
Sarah approaches her friend's sister and tells her about the rumor and asks if it might be true.
Sarah's friend feels validated and safe to come out to Sarah.
Sarah's friend overhears the conversation and feels betrayed by Sarah.