Poor Andy Bernard. It seems the Nard-Dog is doomed to forever have trouble with the ladies. This time, he went through lots of trouble to give Erin the best Secretary's Day ever... only to have his plans ruined by Michael.
Leave it to Michael Scott to mess everything up: over lunch, he spills the beans about Andy's past relationship (and engagement!) to their co-worker, Angela. When it came time for Erin's party (which happened to be planned by Angela) shit hits the fan. Or in this case, cake hits the face?
I can only hope that it's not the end for Erin and Andy—their weirdness makes them the perfect couple.