Chip, whilst some blokes are lucky enough to be cool with the idea of their bird getting railed by as many blokes as possible, there are some guys that don't feel that way, maybe due to a lack of self-confidence. Either way, it's not the fault of that person that they feel that way.
I am a bit of a worrier, not as bad as some, but I can't say I wouldn't be worried, even though me and Ms B have been together for almost 8-years. I really don't think that shows a lack of love or trust.
It's other people (like you and Stav) that I don't trust.
....and in a moment of drunken madness, who knows.