I think the angels did not, cannot earn that love. I don't see how any creature can 'earn' anything from God, since all it is and has is His.
Therefore, I think, it is a grace.
Therefore God gives grace to angels whether Scripture says so in so many words or not.
Praise the LORD, you his angels, you mighty ones who do his bidding, who obey his word. (Psa. 103:20)
They watch over the righteous
For he will command his angels concerning you to guard you in all your ways; (Psa. 91:11)The execute Gods righteous judgement
He unleashed against them his hot anger, his wrath, indignation and hostility -- a band of destroying angels. (Psa. 78:49)
This is how it will be at the end of the age. The angels will come and separate the wicked from the righteous and throw them into the fiery furnace, where there will be weeping and gnashing of teeth. (Mat 13:49,50)
Angels watch God interact with men and show mercy and grace..
For it seems to me that God has put us apostles on display at the end of the procession, like men condemned to die in the arena. We have been made a spectacle to the whole universe, to angels as well as to men. (1 Cor 4:9)
Are not all angels ministering spirits sent to serve those who will inherit salvation? (Heb 1:14)
So many think that angels are superior to men in Gods sight... that just is not true