As Lucien spoke Nate realised he needed to reassure Lucien that Nate felt loved too. He was often so concerned with making sure that Lucien knew Nate loved him that he forgot to tell him that he felt the same love from Lucien. It was one of the differences between them, Nate had grown up loved and never really needed to question it. Lucien hadn't and so would always be worried both about giving and receiving. Nate needed to reassure in more ways than he had been.
"You are" Nate said, holding him close, "I'm sorry if I made you doubt that. I feel your love with me all the time Lucien, I know and am honored how much you feel for me. You've given me the greatest gift I could ask for in trusting me with your heart as I've trusted you with mine. And I will protect it for the rest of my life"