If you choose to romance Gale at the tiefling party, Astarion gives you his opinion on your choice.
He’s more positive about Gale than if you choose any of the others, as far as I remember. (He’s scathing on Wyll and Lae’zel.)
Yes, I know he’s wearing his hat. ARRRRGH. But I couldn’t re-do it as I hadn’t saved. ALWAYS SAVE, PEOPLE. REMEMBER TO SAVE.