Boy: He gets twitchy about it. He thinks it means you want to get serious and he's not sure yet if he's looking to get serious. So, you have an hour-long conversation about why he can't be your date to your brother's wedding, because he's not sure where he'll be in his life six months from now.
Man: He says yes without thinking. He doesn't even flinch or twitch or break eye contact. He doesn't overanalyze the meaning of your invitation. He wants to meet whoever you're willing to introduce him to because he's comfortable in his skin.