Should I tell my boyfriend that we will be in close proximity to someone I have hooked up with before?

Almost a decade ago, I had a “fling” with one of my brother’s friends. It lasted like two weeks. Obviously my brother doesn’t know. Anyway, my boyfriend and I will be in the same vicinity as the old fling this weekend as it’s a family get together and he and my brother are still great friends. Should I say something or keep my mouth shut? He’s said before that he doesn’t want to know about stuff like that. And I wouldn’t want to know either.
Should I tell my boyfriend that we will be in close proximity to someone I have hooked up with before?
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