Is my crush leading her on?

My crush is a very jealous guy and he copies everything that I do. When he sees me talking to another guy, he goes and talk to another girl. It’s his way of making me jealous or revenge. There’s this one girl that he talked to a few times. He talks to her whenever I’m not there or usually when I’m talking to another guy. She has started following him around and is always asking around for him. But I never see him doing the same, only with me. My crush gives most of his attention to me when I’m there and doesn’t seem to care for her even when me and her are both present unless... I start talking to another guy.
Is my crush leading her on?
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