just when ye think ye know someone, truly know someone...

do you ever sit and wonder about someone in yer life, they say one thing but do another?
do you ever truly wonder if ye really know that person at all?
they say all the right things in front of others but alone ye find out a whole other side to them?
why do people do this? what's the reasoning behind it, does it mean they trust ye with their real self or does it mean they could care less about ye and yer feelings?

sometimes I just truly wonder about others...