Expectation

I don't know whether I wrote about this before or not
but for sure it is mentioned implicitly every time I got hurt

is it wrong to expect things from people or not?
is friendship means to just accept what they do and never expect
then what is meant of relation
what is difference between a sister or brother and a stranger
why do we trust people more than others?
isn't it because we expect that they would keep a secret or be there for us
and expectation turn by time to belief
and if expectation hurts
then belief Kills