My fiance calls me by his ex wife's name?

Is it unfair for me to react negatively when my fiance calls me by his ex wife (also baby mama)'s name? It's usually when he's exasperated with me but it still gives me a pause. I have a feeling he's still not very sure about what he wants. Or maybe its because his ex won't let him talk to his daughter?
My fiance calls me by his ex wife's name?
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