If you cannot trust, it is likely that you cannot be trusted. The way to have virtually anything you want is to simply give it. I am not advocating blind trust, rather prudent, responsible trust that provides an environment of growth.
Our past can teach us how we have consistently betrayed ourselves when breaches of trust occurred. The unfortunately reality is that we hold onto, grip desperately at our experiences and refuse to take the lesson from them. This only exacerbates the problem and makes loving others that much more difficult.
Want to be free? Free yourself from your past.