blame for what? Because you have the foresight to plan ahead and communicate?
What about writing them an on going email, one that starts out saying that you would like to know a date that she is moving out and asking them to stop pretending they are together when it has been indicated that it is over. Also stating what your feelings are without using any "you" statements and only speaking in terms of "I" statements. Maybe start with that.
Anyone want to be friends on Facebook?
Send me your name via PM