Because its in your mind . You are still in relationship with him / her in your mind . You never came out . You are still dreaming and never stopped thinking . You allow thoughts and memories to roam around . You never do efforts to fight with those thoughts . You kept saying it ' s difficult and you gave up . While in pain you allowed toxic people to hurt you . You kept on replying to those texts that caused you anxiety and depression . You felt emotionally weak and the hope of getting back the person always gave you the peace . You never thought practically that you can ' t change the reality . You always allowed your mind to get control by the thoughts that came to take your mental peace away . You never disconnected the calls that gave you the tears . You kept on matching the people personalties with the one that you created in your mind . You never accepted the change in people . You never blocked those contacts who backstabbed you . You kept trusting the ones who always broke your trust .