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YTA. You're going to break this girl's heart if you do this. The fact that she still calls you dad 5 years down the line means you're someone special to her, and you're prepared to end that and ask her to refer to you differently because your finance has told you to. I AM A MARVELAHOLIC SHIRTThis is not about what works best for you, it's about how it will affect this girl. What will the fact that you've kept involved in her life and now you're telling her she doesn't have a father figure in you, and you don't want to even see her anymore show her? She's going to feel like she doesn't matter to you and wonder if she ever really did. 
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You allowed that relationship to become established, and you allowed it to continue and you should continue to provide her with whatever it is you do- you can't just withdraw that because it doesn't suit you anymore. You might be able to reconcile it to yourself because you'll have a family of your own that you have to concentrate on but I don't see how you'll ever reconcile abandoning her like that- I AM A MARVELAHOLIC SHIRT you will leave her with hurt and trust issues that will be really hard for her to get past. Your fiancé's an asshole too- she's unrealistic and cold to expect her partner to eradicate their past for her, especially when that past involves someone who may not think so but is still a child.
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