Would a guy ignore a girl if he likes her?

hanabi
My friend is into a guy, who stares at her every now and then (well she looks good). The three of us belong to the same circle of friends, we go on trips together, have lunch or dinner together every now and then, but we are not very close.

This Monday the guy was acting weird, and I do not know what to make of it. We have Taichi together every Monday, and he ignored my friend totally. When they met, he did not even greet her. He was still staring though. He only talked to her, when she addressed him directly. On the other hand, he was very friendly with me, when I arrived late he even waved to me. He was teasing me all afternoon. What struck me is that he has never been this kind to me before, and this cold to her, especially because he used to talk more with my friend, than with me. If he really liked my friend, wouldn't he treat her with at least the same amount of friendship as he treated me with. Wouldn't he want to be close to her? Would a guy ignore a girl if he liked her?

My friend is really into this guy, should I tell her to be cautious, and not to get carried away?
Would a guy ignore a girl if he likes her?
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