I watched for a number of hours tonight and while the music is enjoyable I notice often that Efim shuns Diana when she tries to hold him or kiss him. It is obvious she loves him and makes every effort to show everyone that she cares about him. He, on the other hand, shows little affection for her. It has been this was lately.
And he is so immature. When the guests all went to bed on the couch (four of them) and Diana and Efim went to bed he came back to the couch to lay with them. Diana came from the bedroom and practically had to beg him to come back to her and their bed. He went with her, but returned to the couch again and now has gone back to his bedroom.
In my humble opinion, he acts like a spoiled little child who always must get his way.