individuals of this sort are far more likely than are those who grow up secure to have had parents who, for reasons stemming from their own childhoods and/or from difficulties in the marriage, found their children’s desire for love and care a burden and responded to them irritably
Bowlby identifies the developmental etiology of anxious attachment in erratic, burdened, or irritable parental responsiveness, establishing the pattern’s roots in early relational experience.
, Loss: Sadness and Depression (Attachment and Loss, Volume III), 1980thesis