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Children get to choose who they want to love. Don't take that away from the boy. You need to be an adult and suck it up and remain a positive role model to this boy.
It's ideal for the kid to be able to have both his biological parents in his life, from his point of view. He is young and isn't thinking about your feelings, only his. All he knows is that he now has three parents who care about him, and to him that's awesome. But it doesn't mean he doesn't love you. When he gets older, he will remember and appreciate that you were there for him.
As for the fiance, that's a tougher one. He might just want to be friends with the ex for the sake of his kid. I absolutely would not accuse him of still being in love with the ex unless you have solid evidence -- more than just reading his facial expressions.