What do I do with an ex fling who has a new girlfriend but still finds me on other apps or follows me around at events? Is he a narcissist?

He'll even leave his girlfriend to go walk up to me. She's completely unaware. But he doesn't want ot be with me or be friends when I ask what he wants.
What do I do with an ex fling who has a new girlfriend but still finds me on other apps or follows me around at events? Is he a narcissist?
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