I think a few things on this one -
it firstly depends what and how the trust is broken, is it something that is maliciously done or just something that is natural? like for example, sleeping with your boyfriend is malicous, but gossiping is natural, people talk about you and your a fool to think they wont.
secondly, if its you done something shitty and people found out, you shouldnt be doing shitty things and you shouldnt tell people either. people are going to have an opinion, just because they care about you, doesnt mean there happy about it and arent going to see you differently.
thirdly - are you expecting to much? there is trust and theres expectation. think about that one.
lastly - are you choosing your friends wisely? most of the time when my trust has been broken is because i put trust in those who from experience and whitness i know cant be trusted, so why am i or you any different?
also you telling us that you have never broken someones trust?
were all human, and we make mistakes, i trust people who forgive me mostly. because i believe trust is all about knowing that you have a relationship with someone who you feel can take you for who you are, and you havent got to pretend your perfect.