me too! i went through a major trust problem a few years ago, didn't trust anything anyone said or agreed to do because so many times i was let down or found out they had lied. but eventually i learnt who kept their word and who did not, those who did not i dismissed from my life regardless of their status or job! even sacked my social worker because she lied to me! those who keep their word and tell me the truth i am still in contact with. truth and trust are the foundations for any good relationship or friendship, with out this you have nothing to build on.
some people do not understand the importance of telling the truth or how lying makes others feel which is sad but does not excuse them in my eyes. a so called good friend lied to me and then was gobsmacked when i confronted her and told her i was not willing to include her in my life anylonger because she lied to me, we now only interact on a professional level not a friendship one and even then i still do not trust her anymore.

hopefully you too will find some truthful people and regain your trust in them. x