When I was in my relationship with my ex (it was a long relationship) we told each other everything. I trusted him not to repeat our conversations and he did the same with me.
Ultimately, if something is meant to be a secret, why tell anyone at all?
If I tell someone something in confidence I would have every expectation if they were in a committed relationship that if it came up in conversation then that confidence would be shared. Couples just *do* that.
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