Do guys lie about their feelings?

My guy best friend is so caring for my sister. When we went bowling on Christmas day, my sister didn't know how to hold the bowl. So my guy friend took her hand and put her fingers into it. And every time my sister was playing, he came to the scoreboard and checked her points. And give her some advice too. My sister is terrible at bowling, so she didn't score much. But when she got to the point, my friend clapped and cheered. I have noticed several times that he cares about her. I can't ask him directly, but I would love it if my sister and my guy's best friend dated each other. When I teased him saying "Oh! Love in the air" in front of my sister, he said to my sister while smiling adorably, "Don't listen to her; she is out of her mind. Just don't listen to her; that's it." I hope he will ask out my sister soon.
Do guys lie about their feelings?
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