a woman/man, with whom you engage in a romantic relationship, that alienates you from all your friends and/or family.
This person also has such an effect on you that they manage to spend all your time with you. You think they are the greatest person in the world, hence, enabling you to not care that they are slowly sucking the life out of you and your platonic relationships with friends and family.
A person who mooches as a lifestyle. They drain the person they are with financially as well as emotionally. This is a bottom feeder that manipulates another person into a relationship that then evolves into a perpetual usury lifestyle.