How can you tell if a slight older guy likes you?

CoffeeCode
There is this guy in my school who is 18 and he keeps on starring at me and whenever I leave the room he does too.
Today I want to the unisex bathrooms and he followed me in. I don't know if it's him being weird or him maybe liking me? I just don't want to jump to conclusions
How can you tell if a slight older guy likes you?
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