The reason the game ended was due to you being auto-booted by the server due to the 100+ day rule, or something like it. (It can be called the 115+ Day Rule as well for reasons below)
When update 1.1 occurred, Fizzr added in a part where any game that went over 100+ would cause any players that did not take their turns yet to issue out a warning by e-mail. Should those players still not take their turn, then the server would force auto-boot the player after at least 14 days so that the game can be finished and added to the archive of games.
Here is a link to the list of major changes that occurred in the 1.1 update: http://blog.warlight.net/index.php/2012/01/warlight-update-1-10/