Why does he act this way around me?

My ex and I broke up because I was talking with him and heard a girl in the background. When I asked him about the broad, he gaslighted me and we ended it. We are not talking. I blocked him. I saw him a few times after that and he always avoids eye contact, he fidgets around me. He turns his body away from me and always goes on his phone. Why is that?

Why does he act this way around me?
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