Why?!

How can you tell whether a person is ur true fren, or just fren or hi-bye fren?
does it always have to go through many 'tests' to tell them apart?!
just tired of guessing and be sceptical all the time. and feel 'cheated' at some time when i THINK the person is not being honest to me.
it's all about guessing and how good ur 'analyzing skills' are! >.<
i know that i can just stay away from them, and be hi-bye frens but i dont want that to happen coz all my analysis can be wrong! but i dont hv the gut to walk up to them and ask them on their face.
dont know why it turned out like this. or it's just me thinking too much?
but everything seems so obvious! and i think i shouldn't let myself trust the person at the first place. too late now...
Human beings are so complicated!!