Guys, Is he not interested? What does this mean as a guy?

So my crush and I have been chatting a little bit he compliments me tells me that I look good every day and I complement him back. He’s very shy although when I talk to my male coworker, which is his friend and he’s older than him like in his 30s, he said that when he asked him about me, he doesn’t say anything and that he silent. What does this mean? Is this mean that he’s not truly interested or that he doesn’t care? I’ve been trying to chat with him and help him because I know he shy. What does this mean?
Guys, Is he not interested? What does this mean as a guy?
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