Feeling ignored without a cause induces a feeling of uncertainty that inflicts discomfort and a sense of emotional pain which shatters the person. The individual with poor communication & problem solving skills and passive personality traits instead of confronting the issue often resorts to shutting off self in own cocoon exhibiting symptoms of minor depression & anxiety. Running away from the problems and going silent might seem a quick & easy solution but it is nothing but devastating option. It disrupts the peace of mind of everyone around such an individual and takes a toll on their emotions also.  Be alarmed and speak to a psychologist.