To my heart you are fixed or fastened so as not to give way, become loose, or be lost.
Protected against attack  of any disloyal activity.
Feeling safe, stable, and free from fear or anxiety.
Feeling no doubts about attaining our certainty to achieve
Love makes it hard to open up to any one else you have the key therefore it's fasten and locked.
Like a suspect secured in the back of a patrol car
Forever detain in your solitude
The heart  is concerned to secure the feelings against too many foreign ownerships
Seeking to guarantee repayment of [of love] by having a right to take possession of an digression  in the event of non involvements.