It really depends on how badly your trust has been mangled. When I meet someone, it usually takes me a while to actually trust them. When people break my trust, I find it near impossible to trust them again. While I forgive their actions, I do not allow myself to be placed in the same position where they can make the same failure again. Forgiveness comes from accepting the faults in someone else, but does not require us to let those faults hurt ourselves. Forgiveness is easy, it is the insane attempt that many of us make in rebuilding the relationship that is so hard.