In the story of the rich young man, Mark 10:17ff, why does Mark mention that "Jesus, looking at him, loved him ..."?

What kind of love was this and why did Jesus express it for him?

My tentative position is that Jesus was expressing a typical biblical posture that God loves the man who fears God and keeps his commandments (v.20). This man was sincere and strove hard in his obedience.

other possibilities?