Possessiveness is an excessive and controlling desire to have exclusive control or ownership over ones partner.  It includes jealousy, insecurity, and a need for constant reassurance about your loyalty and commitment.  Possessiveness can also include monitoring your activities, isolating you from family and friends, dictating your behavior and appearance, and demanding constant attention and validation.

Constantly telling you what to do is a form of control and an attempt to gain power over the other in a relationship. It can manifest in various ways such as making demands, giving unsolicited advice, criticizing or belittling your choices, or attempting to micro-manage or manipulate your life, leaving you disempowered or with a sense of invalidation.