I do think Hook loved Milah, but the the reasoning he gave to Emma about wanting to go to SB is very telling : “To get revenge on the man who took my hand” not “To exact revenge on the man who killed my true love.”
I think that more supports that he’s going to try to USE Emma romantically, just to get himself ahead. If he was all like “To get revenge for my true love” him then all being like “Oh Emma ;)” would be ultra sketch. I mean… Going to those lengths for your hand? 300 years of plotting and planning and risking your life? Life > Hand. But True Love? That’s something worth the revenge.