Girls what would you do?!?!?!?

If you are in a relationstip for many years and then you find out that your "boyfriend" got married last summer ... wedding and everything but with a girl he doesent Love!!! I know a Guy he loves his girlfriend but his "wife" not at all .. he married her because of his mother .... he is 31 years old.... he is acting like everything is a joke he jokes about that only thing "my wife " would do is taking care of my future kids.. 
Girlfriend lives in his country in europe with her family and his "wife" lives in another country until she get visa  .... she is coming in few months to live with him.  if they 2 will find about this..... 
How would you react ? If you are the girlfriend and he says that he doesent Love his wife he only married her because his mother forced him but he really loves you what would you do?