Was Guus raised as a single duckling from the first day on? If so he would not identify with ducks and a girlfriend would be of no help. Him playing with dogs and spending time with them is not normal duck behavior. It is possible that he needs more attention, but I think he may see you as his mate and as such is trying to dominate you. I have seen this in goslings that have been raised alone without contact with other geese. It is also a common problem with parrots that have been hand fed as a single chick. Birds recognize us by what we wear and how we sound. Try dressing as a boy, change your voice, and see what happens. My wife suggests wearing a hat. Our birds freak out when I don't wear a hat. Another example is one of my serama pullets. If I go into the bird room without a shirt (very warm here) the pullet immediately flies to my shoulder. With a shirt she runs from me. Good luck.
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(I have never hurt him back though)