Please help

So there’s this guy that I like. He’s really cute and kind and we’ve known each other since we were kids. But then he moved so we lost contact for like 10 years. A couple months ago he added me on snap and we started talking. And now we don’t talk anymore. I want to get to know him better but I don’t know how to start a conversation with him. I don’t have his number, but I think he has mine. And I’m very shy but I really really like him.

How do I start a conversation that doesn’t end in like 2 seconds? How do I even know if he likes me??