Why do close friends feel compelled to leave out certain details when you have repeated asked them to give you all of the information? At the time, you trusted them enough to believe that they have given you all of the information that you need. Instead, you find out from a very reliable third party later, that your friend left out some very important information. Information that would definitely have you questioning their friendship.
Now not only am I questioning their actions in the situations, but I am questioning why they felt compelled to omit certain facts; thus making me look like I complete fool when confronted about the situation from the third party.