This really attractive guy is always alone?

I'm in college and live on campus and I always see this cute guy who is always alone. I see him mostly in the cafeteria but other places too. I've never seen him with anyone else. Its just weird because it seems like he could be a really cool guy but it looks like he has no friends. I kind of want to talk to him but would it be weird if I invited him to sit down with my friends and I one day?
This really attractive guy is always alone?
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