As soon as you trust yourself, you'll know how to live.
-Johann Von Goethes
If you dont trust yourself who can yhu possibly trust.? You cant trully expect someone else to trust you if you cant or dont trust yourself. You should always be open to giving someone a chance. My moto is that "I trust everybody until they give me a reason not to". So I believe you should always TRY to trust the next person. Then, maybe you'll learn new things and/or experience new stuff.
-China