I actually surprised they didn't fling that prince to the other side of the world for this, this actually can destabilise the entire kingdom
Yeah, but I wouldn't be surprised if the mangaka don't commit to the fallout.
Can you imagine what the talk among the nobles would be; that the crown prince couldn't at least give his fiancée the basic decency, at least for scum like him, to keep his infidelity hidden or until after marriage? And this is the future king, who "loves" his fiancée but can't keep away from having a side fling?
This Prince is even worse than the idiot noble who ignored his fiancée just to be with another woman just because she's his childhood friend, FFS.