here are the pesukim. It says pharaoh and his servants had a change of heart. Rashi says that the end of the posuk only refers to pharaoh but not to his servants. Their change of heart was because they "lost" their valuables.
So my question is what exactly was their change of heart. They originally thought they were going for three days and this never changed. And also why did they have to fool pharaoh and not tell him straight out the truth that they were going for good.