All heard animals have a natural predator that is praying on the heard. Humans achieved to raise at the top of the food chain with all the innovations and science there is barley any threat from other animals and micro organisms. The most effective predator that is still praying on human beings is the human being itself. In particular the psychopath. You have more chances to be hurt by another human beings than anything else, they are perfectly disguised to, they look normal from the outside there are very little things that betray them from the outside, it is only after a period of time of interacting with them or observing them that you can recognize them.
It is true that all serial killers are psychopathic but it is not true that all psychopaths are serial killers, As a matter of fact some of them hold quit high and respectable functions and jobs. Certain jobs tend to attract this type of people, jobs that generally involve "hurting" other people like: surgeons or layers, or jobs that gives them power over others like politics. Having a lack of empathy and compassion gives them an advantage in this fields. But not all of them are smart enough to become layers or doctors, when they are not to smart they tend to become your average thief or scammer etc.
The ultimate dreams of a psychopath is to abuse the people around without any consequences as a matter a fact if is possible the victim of abused to be happy and contempt with the abuse.
If you are going to defend yourself you need to be able to recognize certain common patterns of behaviors. If you have something that a psychopath might want from you, this could be money, connection with influential people or you are physically attractive etc. Defending against the low intelligent psychopath is a lot easier because they are more obvious with their attempts of hurting others.
Dealing with a high intelligence psychopath it is where it gets tricky because the main tool of control that they use is manipulation. You can expect to be treated very well in the beginning. A huge red flag is someone that is treating well only the people that has something of value to offer.
Being very charismatic gives you power over others, learning the right thing to say at the right time, allows you to manipulate people and get what you want in an unfair way. Another red flag is if you are being treated abnormally well by someone. Like with all scams if it sounds to good to be true it is probably a scam.
If you fall for it and now you are in any amount of bondage with this person, gradually after a period of time the dynamic of your relationship is going to change. From the very attentive person that you originally meet now you are interacting with someone that is neglecting and abusing you. What i would recomand to do in this situation is to confront them on the abuse they inflict on you.
You can aspect one of the following responses:
receive an apology, without a change in behavior or just a short temporary change in behavior;
receive a justification of the behavior as being the secondary effect of an external event.
Both cases are bad enough, keep doing this will eventually give you closure and allow you to detach and move on. Sociopathy is partially genetic and environmental, today there is no cure for it, there is no point in attempting to fix the other person or aspect that the other person will change for you.
If you chose to break the contact with a sociopath, they will often attempt to bait you back in few ways like: make you feel guilty about the fact that you are living and try to look very hurt about the fact that you left, send letters, emails or text messages etc.