Is he a red flag?

So I have this boy in my uni that I always caught him staring at me and when I pass from his group his friends keep teasing him and laugh , when I talk to a male friend he keeps giving me these stares , one time me & my male friend that happened to live in the same building with me came back together and then I found him near our building when he saw me he tried to hide but I already saw him , we don’t know each other I only talked to him one time & that’s it. Should I be scared of him or what what does his actions means anyway please I need your help 🥹

Is he a red flag?
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