Why have we stopped talking to each other?

I used to have this flirty relationship with a girl for a while, a year or so, but then it kind of stopped. It's been months since we've talked, and we don't even greet each other anymore. Recently, the last time I saw her, we just looked at each other, then looked away.

We got each others' jokes and we used to be so happy seeing each other. Now it's like we dread it.
Why have we stopped talking to each other?
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