Is it petty to not talk to him?

I liked this guy for a few months but he chose to date another girl over me in just as little as a week. He knew that I liked him but was always unsure about what he wanted with me. After choosing her, he still chat with me as if nothing happened. I pretend to be busy and not talk to him as much before and he doesn't like it. He even texted me "stop being so sad lol."

Is it petty to not talk to him?
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