A painful discovery has been how uncommon true friends are, and how easy it is to find enemies right beside you. I have been shocked by my inability to distinguish ally from foe. But at least I am wiser for it. Naive trust has been costly.
We've all been there and done that. Trust in those who use us for whatever but are not the loyal friends you thought they were. You feel like you were blind but that comes from being a human looking out for others. We live and learn and when we are hurt we really learn, and it's hard to trust again.