Guys, How do I tell if this guy could be interested in me?

So, my friends boyfriend gave me his cousins number and told me to text him which I did and he responded. We had a simple conversation but then he stopped texting me. I found out from his dad that he's really shy so I started texting him again and we'll joke around sometimes. I always have to text him first which makes me feel annoying. I've never met him in person so it's kind of hard to figure out if we'd like each other. He's said that he'd like to hang out with me but he doesn't flirt with me. I just don't know if I should continue with trying to talk to him or give up... please help!
Guys, How do I tell if this guy could be interested in me?
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