I understood it differently.
He dated Jodie. Then also dated Akemi because of his work, so dated 2 women at the same time. But Akemi was still because of work.
Similar to an actor doing kissing scenes etc.
That's why Jodie also said that's it's not a big deal, since it's because of work.
But Akai noticed that he has real feelings for Akemi over the time, so he decided to break up with Jodie, instead of keeping it up with both women.