Guys, how do you know if a guy has a crush on you?

He is going out with my friend but he is always asking my friend to hang out with me and smoke and eat with me and we even "netflix and chilled" with my friend lol i felt uncomfortable with that so i left? am i delusional or is something up? he also introduced me to his dad.
Guys, how do you know if a guy has a crush on you?
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