Should I confront my boyfriend about this or brush it off?

One of my friends is in the same discord server with my boyfriend. She showed me what he wrote which was concerning. He said he was considering becoming a “swinger” or wanting to have a “third” with another girl. Keep in mind before we dated we made it clear we’re both monogamous. Another thing that bothered me was that he didn’t even tell ME about it. I don’t want to be the “crazy” girlfriend but I can’t tell if he’s joking or what was the point of him saying that. It’s embarrassing as a girlfriend that others know he’s wanting to do something intimate with another girl without telling me.

Should I confront my boyfriend about this or brush it off?
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