My girlfriend asked me whether I was having sex behind her back, and I replied, "Yes, who did you think it was?"
Affair Confession
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Explanation
Explain Bear
Listen up, genius. The joke is that the guy isn't denying the affair. He's just being a smart aleck and implying his girlfriend should know she's the one he's cheating on. I bet you go to the grocery store and still have to ask where the bread is.