If Tenzin was the one sick, you bet your sweet ass Lin would be ripping the whole city apart to find answers. Not that she's biased. >___>' Haaa Lin won't kiss him, he's married, she's not that kind of lady. If only...but Lin sees what could have been and that her life isn't as solid as she thought it would be. Everyone around her is married, has life figured out and she's kind of on the outside still. She certainly wishes she could have done things different when it came to her and Tenzin (and Pema). 

Asami will confront him but they have done a lot of hashing feelings lately. She doesn't want the kiss to be a wrench in their future relationship, nor does she want to be reassuring him over and over, nor does she want to be worried when Korra and Mako are on their own. She wants to trust them but to her, she got super blindsided by it though so she probably wishes she could have seen more signs of it. After all, she didn't care that Mako and Korra were friends and pro bending together but only when Bolin mentioned the kiss and Mako got super possessive over Korra, did Asami feel like shit. So she'd love to go back to trusting Mako and Korra again, but doesn't want to be made a fool either.

Korra needs to be a good friend to Bolin. It was kinda one sided at certain points and I still believe they can have a cool bff relationship before anything romantic crops up. Bolin and Korra just need to go back to their core where they could goof off and be silly without her worrying about bending, and with him not worrying about him and Mako's living situation (they do need their own apartment though, go be adults with bills lol).