Question

attach oneself to someone
1. Fig. to become emotionally involved with someone.
  Fred seems to have attached himself to a much older woman, who has captured his attention.
  Somehow, Susan has attached herself emotionally to Tom, and she is distraught over his being away.
2. Fig. to follow after someone; to become a constant companion to someone.
  Andy's little brother attached himself to Andy and his friends—much to Andy's distress.
  John attached himself to his older brother and drove him crazy.