Naruto being the nine tails jinchuriki he is, is full of insecurities. He loves Kuna, he really do. But due to his insecurities and believing he is a monster, even after marriage he barely gives Kuna any attention

Today Naruto was home with no missions lately, so he was at home sitting on the couch watching TV while Kuna was reading a book on the other couch

Naruto: "Man this show is so boring. I gotta chance to something else"

He said to himself but actually trying to make Kuna go away from him scared to hurt him somehow