Why would a guy friend say on the phone “if you hook up with a guy I want you to be honest with me” when I told him I got invited to a guy’s party?

Why is he acting like this? And the. He said “im going to hang up now because i might start saying stupid things”

Why would a guy friend say on the phone “if you hook up with a guy I want you to be honest with me” when I told him I got invited to a guy’s party?
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