The weak point to find in the "other" person, the gap to be filled in order to later control and possess that person like an object.
The manipulator will not teach you how to solve a problem; he will solve it for you, not in order to be useful, but in order to be necessary and acquire power over you. His initial goodness is by no means disinterested. The manipulator can also spoil you (by creating new fictitious needs) and often seduce you by using sex for the purpose. When he realizes he has acquired enough power over you, he will change the way of dealing with you by turning from good to aggressive, from accomodating to domineering, from sensitive to ruthless.
Those who suffer this manipulation are in for an even long period of utter tyranny. Coming out of it requires a lot of patience and humility, but also a lot of courage and a tendency to put oneself in question in order to find out the reasons and causes and rebuild one’s own identity. In this moment the victim of the manipulation must be able to honestly look into it as it is, not as he/she wishes he/she were (the idea of himself/herself); the sooner, the better. If the victim manages to hit this road, at its very end he/she will find out many things that were once hidden from him/her.