I think the answer to that question depends on the vows you agreed on when you got Bonded, doesn't it? If you and your partners agree that each of you doesn't have to tell the others if they have another partner when you get Bonded, then I suppose it wouldn't be considered unfaithful, since you all agreed on the possibility of others from the start.
Other people might see it differently, though -- including the other person you Bond with. But I could see a situation where someone might not really consider it any of their business who else someone might be Bonded to.
text; un: katsuragi
Other people might see it differently, though -- including the other person you Bond with. But I could see a situation where someone might not really consider it any of their business who else someone might be Bonded to.