The scene better be worth it! I'm sensing I'm probably going to be disappointed though because I prefer a Alistair-like romance and I don't think Iron Bull is going to be a romantic like that. I wish a male could romance Cullen, but alas.
I hear you! I wanted Cullen, and if not Cullen, then Blackwall, and if not Blackwall, then Solas. That... did not go well 
But I'm just beginning Bull's romance and it's very nice. Very cute. I think you will feel at least a little bit satisfied
(I know for me personally I'll never be completely happy b/c I'm too let down and disappointed, but so far Bull truly is great.)
Got a cutscene with him where I hit him with a stick and flirted with him after advancing the main plot, but unfortunately still no Tough Love quest. :'(
Yes, I got that, too
Just keep working on his approval. I also got nothing but "goodbye" after that cut scene.
I suggested the racing thing to another member on here and they were able to do the romance after that approval boost. So that's still something you could try. His romance scene just requires tons of approval for some reason.
I am that member, and you should listen to Chernaya
This is how it happened for me:
Recruiting the mages earned me "greatly disapproves." Therefore I had to really work to earn his approval back. I did the following...
Recruited the Wardens ("greatly approves")
Kill Venatori (lots of "slightly approves")
Complete "Demands of the Qun" (I believe this earns you some approval but I forget)
Win all three races (three "approves")
And BOOM I finally triggered a romance scene back at Skyhold.