What does "the opposite mean"?

I've been casually dating this guy for a few months now and we are not exclusive yet. A few days ago I was talking with a guy I've been flirting with and he was really offended and he did not talk to me for two days. Finally he gave in and called me. I asked him if we are friends again. He told me that "no I was thinking we could actually be the opposite". I told him if that means that we are enemies now and he just laughed. What did he mean?
What does "the opposite mean"?
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