My boyfriend keeps bringing up situations and when I ask more about them he says ‘it’s private’?

For example, he told me he had a really awkward conversation with his friend. I asked him’ what did he say?’ And he told me ‘it’s private ‘. He’s done this in several situations and I find it abit annoying. If he didn’t want to tell me then why bring it up?
My boyfriend keeps bringing up situations and when I ask more about them he says ‘it’s private’?
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