Why would my friend be worried about what he's exes might of told me?

JC1981
I just happen to know and be friends with a couple of his exes. He said it kinda freaks him out that I know them and worries about what they might of told me regarding what kind of boyfriend he was. I don't understand why this worries him.
Why would my friend be worried about what he's exes might of told me?
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