He didn't feel 'safe' as in, not a safe partner with whom you could give/receive emotional support.

I see his 'if you leave me, I will cut' as emotional blackmail, pure and simple. If you truly love someone, you simply don't say something like this.

And yes, I think the body tells the truth. I would trust what your body (or guts) tells you instead of one's rationalising what we sense at a deeper, truer, level.