What if a boy stares at you when he is talking?

he is into you give him a flirty look and keep and eye on him in future to see how things unfold

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I'm a guy and I look my girlfriend in the eyes when I talk to her. It shows I'm interested in her, I'm interested in what we're talking about and I'm "there". I'm not off in my mind thinking random things, I'm with her talking with her.