Why he is acting like that? I don't know about dating or love stuff?

I just transferred to the class. At first he was interested in me but then he started ignoring me. Luckily, we ended up in the same group and he was very friendly at first, asking why I changed schools etc. Then his friends started looking at us strangely. In fact, there was silence while he was talking to me. Then he started completely ignoring me. He acted like I didn't exist. Our presentation is coming up and sometimes we talk as a group and he looks at me and tells or listens to certain things. Do you think this is normal or am I taking it personally because he is handsome?

Why he is acting like that? I don't know about dating or love stuff?
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