I work in the DV field, and one of the best indicators of dangerousness is the victim's perception of dangerousness. If you feel he is capable of harming you, there is a good likelihood that that is so. Trust those instincts. It doesn't matter if no one else believes you.
I really suggest you contact the DV hotline and get hooked up with a counselor who can take an objective look at your situation. It might be the reality check that you need. There are several lethality assessment tools that can be used to get an idea of how dangerous a particular individual might be. There is a free online DV danger assessment tool at
www.mosaicmethod.com. A DV counselor can also help you with a safety plan to help keep you safe during this sometimes volatile time of separation.