Ya, but it far more commonly goes the other way. Asami walked in on Mako "cheating" on her (more accurately, Mako being a deer in the headlights as Korra just grabbed him) and I can honestly see her never talking to him again. Thats an entirely normal reaction.
And then it goes nowhere. Like, Korra and Mako are a thing for what? 8 episodes, where they break up early in Book 2 in one of the dumbest most overly dramatic fights I've ever seen?
Come on writers, you made Korra look like an absolute b**** for pretty much no payoff. Why didn't they just have Asami and Mako split up and then have Korra sweep in? Less drama, but it's still there for playing around with tension, much easier to patch things up, and Korra doesn't look awful. Simple.