Why would he want me to do it and not her?

While at work he came to her and told her he wanted me to do something for him she offered to do it but he kept insisting I do it. He wanted to show me but the other girl told him just show me, but he didn't want her he wanted me. It really didn't matter who did it just as long as it got done. And it was something so simple which made it kind of bizarre. She even kind of gave me the side eye and even I thought it was a bit strange that he wanted me to do it instead of her.

Why would he want me to do it and not her?
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