Yeah. I mean we may hit some cliches because teenagers are walking cliches in a setting like this. World isn't at stake like in TLA, so Mako's biggest issue is women xD so I'll take a cliche admittance/belief that he's in love with her, could also be because of he's guilt. Mako is super flawed in the romance department and isn't as pimp as he thinks >.> so if you think it was cliche, I accept it, I did too really. Not to mention Asami did kiss him again in like Season 2 and he just pretended he was totally fine with Korra right in front of her after their fight. So, yeah, Mako's a piece of shit with girls in canon. I'll take a slightly cliche but humble and meaningful Mako over the canon one.
Bolin kinda brought up that Korra did change in his mind due to what she did with Mako, and it's less about Bolin's feelings getting hurt and more about what she ended up doing with Mako and never apologizing to Asami. I don't think Korra ever saw Bolin like Bolin saw her and that's why there's a disconnect between them now. She never looked at Bolin and saw a boyfriend, she saw a best friend, and I don't think the show did these two right in Season 1. It was never clear if Korra understood Bolin REALLY liked her as much as she liked Mako. So, yeah, Korra's willing to move on but Bolin's line made her wonder if that was going to be possible for them.