This could have a number of meanings, none likely to involve any violence. The dream probably dramatizes the expression, "She's killing me!" This might describe a terrific joke or hilarious behavior. Alternatively, it can describe intense disappointment and betrayal. Again, it can relate to competition, as is, "She's killing me in tennis." Or it might have monetary meaning: "She made a killing in the stock market." One more comes to mind - she may be so beautiful that "she's killing me!" In all of these possibilities, the dream takes a figurative expression and presents it as a literal, concrete act.
it means you do not trust your girlfriend.
If you dream about having a girlfriend, it does not necessarily mean that your man is straight; it could be due to your fears of finding out that your man is not straight.
The dream probably expresses your jealousy or feeling of being inadequate to hold the girlfriend's interest.
It more than likely doesn't mean anything; a dream is just a dream. Don't hold your girlfriend accountable for something you dreamed happened.
The dream expresses your own desires and emotions. It does not predict the future and it does not reveal your girlfriend's thoughts or feelings.
that you dont like his girlfriend
This dream illustrates your own feelings about your girlfriend rather than revealing her behavior or intensions. You might suspect that she is cheating, and the dream reveals your suspicions. That does not mean that she is cheating.
maybe because you want to be with her in that moment.
That you have not yet moved on.
The dream expresses your own emotions. It does not provide any information about the guy's thoughts or feelings, or those of his girlfriend.
that you are a cat person
It may mean you would not be averse to 3some.