I personally believe that it would be much better for you if you could find the self-control & conquer this yourself without needing him to change his password.
Changing his password makes it easy for you to stop, because you have no choice, but doesn't really beat the urge you are having deep down. I think it's just as important for you to deal with that self control issue which would be achieved more effectively coming from your own inner strength rather than from him changing his password.
Just my opinion.
Me: 34, Wife: 34 Son: 2 Married: 8, Together: 14 Wife moved out 8/25/2013 Divorce papers received 01/10/2014