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Sexual tension and awkwardness?

There is this guy I met recently and we haven't spoken much but I catch him staring at my direction when I'm looking away, he gave me his Instagram and I've looked at it but it gave me the impression that he's self absorbed and vain so that kind of put me off.

I didn't see him for another 2 weeks until today. He started hanging around with my friend and was following her everywhere and talking to her right infront of me as if I didn't exist. Then I went to the common room for a break and I saw them quietly sitting next to each other and I felt super awkward walking in. I don't know why it felt so weird! People make fun of him and my friend because they are seen together although she is not into him at all and he never tries to speak to me but I feel this unspoken feeling between us. Is this normal?