[Luke makes a bit of a face, unsure on how he's supposed to answer that without overstepping some boundaries. Han's a friend, and even though Luke grew up on a planet that's 80% sand he can still put 2+2 together when it comes to relationships.]

Well, that's the problem, isn't it? If you say that you need 'people like him' then he'll just tell you that we can find someone else like him. [Or probably saying something like 'there is no one like me', because Han, but still.]

If you tell him you need him, I'm sure he'll want to stay.