Stardew Valley creator ConcernedApe has said he will not add cheating or affair options to the game.
He says they are too serious and do not fit the fun, relaxing feel, even though he once discussed what might happen if you cheated, such as the town turning against you or causing family problems.
He is also unlikely to add breakups for the couples already in the game because it would require too many changes to the stories and conversations.
He is currently working on his next game, Haunted Chocolatier.