Anger runs through you before subsiding into a groaning sense of impotence. You feel sick to your stomach. You promised him this would not happen, that it would all be sorted, that things are fine.
Things are very much not fine. You cannot tell him so, he will feel as you do now, this would not be fair to either of you.
You must find a solution alone, implement it.
How could they spring this on you like this, why did you make such assumptions that all would be well?