Isn't there a law to bring this Gorilla into a better housing ( at a zoo or rescue centre ???? : https://www.youtube.com/watch?v=OYYL2LxotA8&feature=youtu.be
Ivan was eventually moved to Zoo Atlanta. He was given female company too, but he didn't breed. He died some years ago.
Thank you Pertinax for this extra information and good to know he had at the end of his days a better life !