@xp29
This might have been a misunderstanding what I meant with "afraid":
He was not afraid of the dubias themselves but that they might lead to an infestation and then time-intensive cleaning, pest control... would follow. (Likely the same for your girlfriend who knew what is going on with "roaches".)
Same as, me absolutely not being afraid of insects themselves, I was afraid of... expensive stuff that follows after I saw cockroaches entering our former apartment. Or when I found mice running around in the same apartment - not afraid of mice at all (as a pet, in the garden, in the forest), but afraid of having to throw away stuff (food they got into - just can't lock away everything into mice-proof boxes, so expensive), them gnawing on wires (I once wanted to unplug a device and had almost touched live wire - insulation was gnawed away at the side facing away from me so hard to spot!), what if they might get into important things such as documents or my (work) laptop... Things to replace that are really a "pain in the ass" if money is tight.
That kind of "afraid" like "oh no please not..." and not the "afraid" like "screeeeeeeeam and running out of the room".
Same for my husband. I was knowing they can't reproduce here if escaping, and thus he's more fine with them now. Same with hissing cockroaches.
Same for him. He doesn't like them, but he knows that there won't be an infestation.