Is my husband flirting if he calls a woman babe on an online game chat?

I found a string of messages to a woman on an online game chat and while all of the talk was mainly about the game and seemed harmless the conversation was started with "hey babe wyd?" And I could not find any previous conversations.
Something is going on.
It's harmless.
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I already confronted him. It did not turn out well. He swears it was harmless but it has been a big fight ever since.
Is my husband flirting if he calls a woman babe on an online game chat?
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