Slick - I have to be very certain in dreams like yours, and usually I base what I say on experience. After struggling with the meaning of your dream I was strengthened in my view by the following.
Many middle aged women dream of ‘losing’ their husband while out with him, perhaps shopping, or walking in a town somewhere. Sometimes the dream portrays him actually killed. The dreamer often wonders if her dream was a premonition. It is more likely a form of practising the loss, so it does not come as such a shock. The greatest shocks occur when we have never even considered the event - such as a young child losing it’s mother - an event it has never practised, not even in fantasy, so has no inbuilt shock absorbers. As most of us know, men tend to die before women, and this information is in the mind of middle aged married women.
My husband and I go out somewhere together, mostly in a town or built up area. After a while I lose him, and even though we arrange to meet at a certain place, he's never there when I arrive. I'm looking everywhere and desperately asking passers by if they have seen him. The sense of loss and panic is awful and people keep saying "Yes, he is over there, or went that way." I never find him.
Eventually we all die so dreaming of losing your husband is a way of preparing for and practising when we actually lose them.
Tony