I have no idea how typical his thoughts and behavior are for someone with his background. Typical or not, though, there are two things that particularly caught my eye in what you said:

1. He has a lot going on in his mind that troubles him and you and yet, evidently, he has not seen a psychiatrist or gotten an assessment. He apparently isn't seeking help despite the seriousness of what is going through his mind.

2. You find yourself doing explicit risk assessments of your boyfriend, in order to judge how safe you are with him. You are here asking us for assistance in that regard. Neither you nor we are professionally qualified to make such assessments, yet your life could depend on them.

If you are considering continuing the relationship, in my mind it is imperative for both you and he that he seek assessment, and help as needed, from a psychiatrist.

He should be willing to share all of the findings of the psychiatrist with you. And in looking at those findings, you must remember that the psychiatrist has him as a client, not you. I think therefore that you would be wise, right now, to begin to discuss the situation (and the findings if/when they are available) with a different clinician, for whom you yourself are the client.