Well, I do agree he over-reacted, seemingly both to the initial incident and to your response to his over-reaction. Assuming no other side effects besides A) bee is gone and B) hamburger is gone occurred, I seriously doubt I, personally, would have reacted beyond asking for clarification on why you just threw your meal out a window and then probably saying "Oh" or "That is absurd" (more amused than angry). I wouldn't have carried on an argument about it; it seems like a pretty minor event, certainly not worth getting steamed up over.
OFFICIAL RULING: Even if your boyfriend felt that it was not a good way to get rid of the bee, he should not have reacted to the degree which he did.
Unless new facts come to light, I feel no further need to examine the matter.