There is cheating in the truck when FMC kisses the worker. Anything done with someone else not told to the partner or with their consent is cheating still.At the moment there is no cheating in it, only soft flirting which could be seen as teasing, and if the MC gonna allow her to play the field with other guys, then it not really cheating but sharing.
And from the MC perspective with other women, maybe he will get some other LI girls, so far he only flirted with some, but not sure how that future will be, might be as well the Fiancée allows him to play the field with other women as well, we will see how the developer will all add things to the game.
The only thing I don't like currently is the boss' past with the FMC, I don't like that. I'd rather that past not existing and his role in her life be done differently.
But these kind of games are rarely done well, or rather, perfectly to what I want, so I take what I can get and enjoy the parts I do like.