Paranoid personality disorder
Pervasive distrust and suspiciousness of others such that their motives are interpreted as malevolent, beginning by early adulthood; ≥4 of 7: suspects exploitation/harm/deception; preoccupied with unjustified doubts about loyalty; reluctant to confide; reads hidden threatening meanings; bears grudges; perceives attacks on character not apparent to others; recurrent suspicions about fidelity of partner