I would be wary of any of these AI sharing games, especially Shadows of Ambition and this game. They generally all start to slant towards the main FC being out of control. This game is no different. You don't really control her, she'll still flirt with anything that moves and you'll be put into situations where she'll do things without your permission.
The current update in particular is proof of that, and I only see it getting worse.
That said, the FC will always profess her undying love for the MC and the MC always says he loves what is going on (well, except for the 2nd last scene in this update) , so if you're okay with that, go for it. It's not 'cheating' and he's not a cuck.