Thanks for stopping by, Dianne.
Childhood events can leave permanent scars upon our psyches because we're at such a vulnerable and impressionable stage of life. When our homes are broken into, it is a major security breach and invasion of privacy. For a child, this is extremely traumatic.
One of the most basic human needs for a child is to feel safe. Even though you are grown, you still harbor a deep-seated fear of insecurity.
Additionally, it is possible that you feel you don't have clear boundaries and others attempt to "break into" your sense of self. Reflect on your waking life circumstances and relationships to see where you can strengthen yourself.
I encourage you to try some Dream Therapy during which you can relax and do some meditation exercises. While in meditative state, you can enter a sort of waking dream state (aka. daydream) and imagine yourself fortifying your home. Make it beautiful--anyway you like--but surround your house with an invisible but impenetrable energy field of light, love and protection. People can enter only with your permission.
Redream your childhood experience: See any potential invaders as not being able to enter due to locked windows and doors. Same for your old friend's break-in. Dream about a protective dog standing guard and chasing everyone away.
Do you have a dog in your waking life? It might be a good idea to get one or two. For friendship and protection. Very good tokens to have around.
Thanks for your support.