His eyes are begging: "Please, don't go... stay. You are everything I have..." and that is the saddest thing of the scene, wich is also sad. Even if Thranduil give him the idea of going after Aragorn, he didnt really wanted him to go. And when he said "Your mother loved you. More than anything. More than life" he actually meaned "I love you. More than anything. More than life". Thranduil can love. Thranduil still has a heart.