Each relationship between two persons is absolutely unique. That is why you cannot love two people the same. It simply is not possible. You love each person differently because of who they are and the uniqueness that they draw out of you.
When we three spoke ourselves into human existences the Son of God, we became fully human. We also chose to embrace all the limitation that this entailed. Even though we have always been present in this created universe, we now became flesh and blood. It would be like this bird (a jay), whose nature it is to fly, choosing to only walk and remain grounded. He doesn't stop being a bird, but it does alter his experience of life significantly.