Real life work relationships, I feel like the most sympathetic ones are fake

which means the ones I like to chat with I have no confidence in them, weird...
Even being aware of hypocrisy it means I'm one of them, or does the fact I really enjoy to talk to them even knowing I can't trust them saves me ?
With all possibilities of having this or being that I couldn't pretend anything, but as I could observe variations in some people depending some days, I might be concerned, not always the same mood, but is it really normal to always feel the same ?
Like when you know you haven't do anything against someone but you do observe a change in his/her behaviour, someone else probably trash talked on you, but the worst is he/she has been convincing
Like when people are too nice or too rude with no reason, and you're like " what did I do to deserve this ? "
When they are too nice, do you really deserve it ? Is this suspect, or their nature ? And becoming aware of the situation doesn't risk to change your mind, to make you overthink instead of appreciating ?
Some situations are confusing to me, sometimes you physically appreciate a woman, by her being rude, you understand there's no way, at least now, but when a woman is nice, and you do like her, it's not so easy to see how she likes you, if she does...
So you sometimes think you could have this woman, but it's not so simple, is it ?