Is it true that if a guy likes me I would know?

There is a guy that keeps me wondering if he likes me and my friends keep telling me that if he liked me I wouldn’t be wondering and if he really wanted me he would’ve talked to me by now. He stares at me all the time and he can’t take his eyes off me. He asks dumb obvious questions to open conversations, he smiles brightly whenever he sees me. My gut feeling is telling me that he likes but why isn’t he doing anything about it?

Is it true that if a guy likes me I would know?
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