My boyfriend's friend keeps staring at me?

I am constantly being stared at by one of my boyfriend's friends. He only looks at me while we're all conversing in a group situation, and he does it whenever I'm not looking, or if I happen to catch him, he’s still staring. If his back is to me, he’ll turn around to give me a quick glimpse. I initially didn't give it much thought because I am aware that people occasionally have a tendency to stare, or perhaps he was simply focusing on something else. But it's becoming more often, and I'm not sure what to do about it. Do I look weird or something? Is there something he knows that I don’t? If I see his friend doing it again, I'll consider telling my boyfriend about it, but I'm not sure if he'll believe me.

(Please be nice in the comments. Thanks!)

My boyfriend's friend keeps staring at me?
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