Federal election. New regime. New people. At that point the deal could have been cancelled. It wasn't. Reasons never quite clear for continuing.  Blame now rests solely with party and leader who completed the deal. 

(Please note. In our Parliamentary system, once there is a change of government or even a reassignment of responsibilities with a Cabinet, the new people become responsible and accountable for everything done previously. That puts the blame solely on the incumbents).