Does my crush potentially like me?

I like my guy friend, but am too shy to show or admit it. I sometimes think he likes me back because of things he says, and he's always staring. Well he introduced us to a girl he is talking to and we all went out to lunch and she sat on his right & I on his left. Majority of the lunch he faced and interacted with me. Should I flirt with him before they become official? Or did I lose out on my chance with him?
Does my crush potentially like me?
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