Why would a guy lie that I am not interested in talking to him?

I happened to meet my ex. He was with a friend. We sat next to each other but didn't talk. I saw him looking at me also his face beaming with anger when trying to cross my path.

But he made conscious effort to remove his friend sitting between us on multiple occasions so that we sit close.

I don't know what he introduced me as, however he was loud when he said ' she used to talk to me really well and then gradually conversation and closeness faded'.

Why would a guy lie that I am not interested in talking to him?
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