This is heartbreaking. I had something similar with the oldest of my four kids. It was about two months or so of the silent treatment. Also similarly, Dad was out of the picture. Mel left us for...well, I won't go there. Point is, Joey, my oldest, started backtalking almost everything I said. Then it became no responses at all.
Long story short, he finally began speaking to me again out of the blue. He CLAIMED it was a schoolyard dare to see which of his friend group could go longest without speaking to their parents. I still don't quite believe that. But I truly hope your child snaps out of this phase. Much love.
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