Would you appreciate a heads up from a friend that your ex was going to be at a party you were going to?

Hopelessromantic03
So my guy friend and I are attending a gathering, and I’m not entirely sure if he knows who’s going to be there, but I know for a fact that his ex (quite recent, who he’s not really on good terms with at the moment) is going to be there, and because it’s not a very BIG gathering, them seeing each other is inevitable. Should I give him a heads up?
And If you were in HIS situation, would you appreciate a heads up?
Would you appreciate a heads up from a friend that your ex was going to be at a party you were going to?
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