Is there a quote that goes something like ..?

Question

be careful of you trust, who you think you are talking to , might be the opposite of the person you think you are talking to,... or something like that?

Answer 1

I learned you can't trust the judgment of good friends.

Carl Sandburg

Answer 2

I'm not sure about that exact sentiment, but here are a few that are close:

"Trust your own instinct.  Your mistakes might as well be your own, instead of someone else's." - Billy Wilder

"Love all, trust a few, do wrong to none." - William Shakespeare

"In God we trust.  All others pay cash." - Unknown