The Man on the Wall (1982)

Arnulf Kabe and his wife Andrea live in East Berlin. Arnulf has only one ambition in life: to be able to leave the East and live in the West. He hatches a plan to get himself arrested at a border crossing and is eventually bought out by the West Germans. He has reached his aim and is living in West Berlin now, he even has an affair with the attractive Veronika, but he can't help missing his wife. And he finds a way to be able to return to the East: he will work as a spy for the East German state security. That way he'll be able to cross the border any time and pay her a visit. Eventually, he even manages to bring his wife to the West on a borrowed passport. However, she finds it difficult adapt to life on the other side of the Wall.