Suit of Amor

So I got to thinking about old relationships and how sometimes they can break you, change you for the worse.  You learn from these damaging relationships and move forward, but do we really move forward or do we just bury them so deep that you run at the first sight of them?  I cant help but wonder will we ever not be broken?  When your shield is constantly up how does one let them down? You constantly protect you soul from any outsiders and then someone tries to invade it and it shakes you to the core, so you run.  Feel no emotion when it comes to any type of personal relationship.  How can one person be that fucked up because of other peoples behaviors from the past?