I loved how pretty much every time Korra put herself down Asami was there with a compliment And she's still the only person Korra can really open up to.
Yeah I think Korra feeling like Asami's the only person she can tell what's going on is a major green flag (is that a phrase I mean a major thing indicating them getting together )
Yeah aside from when they first met and didn't really get along, I think she's had the best relationship with Asami. She's had her ups and downs with Mako and Bolin.