Why are we so awkward around each other?

There's this guy, and I find him really attractive but for some reason I just can't talk to him. I can say maybe a couple of sentences to him and then the conversation dies out. Vice versa if he starts the conversation. I can talk to his friends just fine, and find myself building friendships with them. But with him, it's always so awkward. Therefore, I'm not friends with him even though I'm friends with everyone else he knows.

He seems to be awkward around me as well. He told mutual friends that he finds me attractive, but there's an awkward silence when we're alone together. For instance, we were all hanging out in a group in his room. Everyone was talking to eachother. But then his friends left and I was left alone with him. There was this awkward silence for a minute, so I said "see you later!" And left.

I don't know why we can't talk to each other like friends. Is it probably just a case of our personalities don't click and we're therefore incompatible, or should I keep trying with this guy?

Why are we so awkward around each other?
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