Why would a guy say on the phone “if you hookup with a guy be honest with me” and “I’m going to let you go now because I might say stupid things?

When I told him that a guy has invited me to his party? What is he talking about? Why did he respond sort of irritated like this

Why would a guy say on the phone “if you hookup with a guy be honest with me” and “I’m going to let you go now because I might say stupid things?
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