First, let me say that, according to the events described, it sounds like you got a really, really raw deal. I feel for you.
Second, I'd like to remind you that there are decent human beings out there. I know that's hard to think of right now. Betrayal breaks not just the trust of one, but the closeness of all. God forbid you risk letting charlatans, monsters or animals-in-human-skin near you again. You have every right to be stingy with that trust.
For now, at least. Besides the obvious of watching out for warning signs, I would recommend gradually working up to your normal level of trust, starting first by re-establishing your faith in the decency of others. Those people who you may not know or even like, but who will when the pressure is on, do the morally upright thing at some cost of their own self-interest. It is the inner strength of the few good folks out there makes life just. Not all of humanity, just a part of it we may never even meet or never even hear about. If we don't have faith that those people exist, then we're done for.[1]
While I'm not religious, Judaism reifies this concept with the "Tzadik Nistar"[2]: at any given moment, thirty righteous people justify the world in God's eyes. If any of those people disappear and are not replaced, the world comes to an end.
Lastly, regardless of my previous advice, I would encourage you to at least know that there are people on here who have been in the same or similar boat. Some of us want to help, to listen and even to care. Yes, some commenters will either delight in your misfortune, or will dispense un empathetic bromides. But I would encourage you to ignore those cretins; they don't matter.
You matter and your faith in humanity matters. It is the key to trusting others again.
[1] Slightly political so feel free to ignore. People who've given up on decency in the world seem to think like this:
http://www.politico.com/magazine/story/2017/05/10/donald-tru...
> Trump’s worldview, based on hundreds of interviews in the last year and a half, as well as an extensive, ongoing study of what he’s said and done for decades, is that everybody is out to get everybody. Life is a zero-sum struggle, and you’re on your own. For him to win, others must lose. “Man is the most vicious of all animals,” Trump told People in 1981.
> “The world is a horrible place,” he wrote in Think Big in 2007. “Lions kill for food, but people kill for sport. People try to kill you mentally, especially if you are on top. We all have friends who want everything we have. They want our money, our business, house, car, wife, and dog. Those are our friends. Our enemies are even worse! You have got to protect yourself in life.”
[2] https://en.wikipedia.org/wiki/Tzadikim_Nistarim#Their_purpos...