I've been dating a guy for a few months and I'm suspecting he might have tendencies of a sociopath. He says he liked to beat up kids when younger for no reason, thinks killing might be fun if you're guaranteed to not get caught, thinks wars and wiping out regions are sometimes best to solve political situations, the list goes on and on. He was so charming and caring in the beginning, shared a lot of personal space and possessions. The radical talk on one hand and his caring gestures on the other was what completely threw me off.
Then out of the blue, he said he needed a break. I thought it was all for the best and grieved for the relationship. Then I found out that he was in town when he said he would be traveling for a few weeks. He used to be really protective of his phone, would even always take it into the bathroom even when we were at the house. I was suspecting he was lying, but now I know for sure he lies. Now I'm pretty sure that all those unanswered phone calls and excuses for not getting back during his business trips were also full of lies.
During his so-called travel (the one he is supposed to be on after the break), he texted me and checked up on me as if to suggest that he will be further pursuing the relationship after he 'gets back.'

Now that I'm armed with this knowledge (have gone as far as to read "sociopath next door"), I am ready to run like mad. I may be starting to get paranoid, but I am genuinely fearful of what he might be capable of. He lives minutes away (he knows where I live) and we work at the same company. I have not confronted him or said I want to break up. He said he is friends with all his exs, so even if I break up, I get the feeling that he'll initiate contact. My life has become darker since I've met him. I just want to run away and not have to deal with this at all. Especially now that I know his true colors, I want to cut all ties and associations and wipe myself clean of him.

What would be my best way of dealing with him without provoking him in any way?
Tell him that I know he lies and thus I can no longer continue the relationship?
Don't confront him at all and just disappear as best as I can from his radar? Or make excuses every time he contacts so that he may not suspect anything?

The answer might be really simple, but without many friends or family in town, I'm really starting to fear for my safety.

Thank you for any advice you can give!

If he is already telling you that he needs a break, and you are unwilling to carry on a relationship with him, you don't have to prove anything.

When he does contact you, tell him that you have decided the relationship is not going to work out. You don't need to offer anybody any explanation whatsoever. If he cannot accept no for an answer, that will be a different situation. But, if you offer up facts to back up your reasons to end it, it only gives him ammunition to convince you that you are wrong, and he may try harder. In other words, keep it simple.

If you are unwilling to tell him face to face, send him an email. Considering that he was the one who initiated the 'break', you simply need to confirm that you are no longer interested. Again, keep it simple.

That he has remained friends with all of his ex's, I doubt that he's got bodies buried in the cement in his basement, and you are probably over reacting. BUT, that you are fearful, is enough in itself to follow your instincts, end the relationship, and don't look back.

Tell the friends that you do have your fears, and then tell him you no longer want to date him. Then completely be unavailable for any conversation, because you don't want to be friends either.

Let him be happy with his exes.

My girlfriend said I was controlling because I ask her to call me when she gets out of school and work haha! Take it easy, everything will be fine. Well, what I would do here is let him know you feel like being alone. You have to be strong about it but not mean. Unlike what the other answers say; I would not tell him off unless I had a friends and family nearby. If you mentioned another guy he might go crazy with jealousy. If he asks you more questions just give simple answers and don't give many details. Start picking up your phone less and less until he eventually stops calling-if you cut him off completely at first he might want you more because he can't have you. A lot of jealous controlling guys see women in a defiant way and if you're just normal about things you'll calm him down more. Tell him how you need to work things out in your life and you don't think you'd be able to love someone right now. He might make some sweet romantic gestures to make you feel better but don't be fooled. Be polite but certain in your words and if he talks to you don't show fear or look away. A lot of guys like this feel like they're righteous and make others out to be the enemy and themselves to be the victim. On the rare occasion he may do something to scare you if he's desperate or be clingy but don't be afraid as long as you're in a public place. If I were you I'd ask to work a different shift from him, oh and in the future don't have work relationships they can be very bad things. If you're traveling at night and you're afraid, alert the police and tell them nothing has happened yet but you feel that it might. If you speak to the right officer they'll keep an eye on you even if he has done nothing wrong yet. They might be able to see if he has a criminal record as well

You let him know you are ready for a break, then stop any and all contact with him.