I'm going to cheat on my gf in the sims 4 version I made of her
You even want to cheat in the Sims? Why?
Yes, there is a reason behind it: it's awesome and awesome alone
I get that it is a video game, but I still think that it is wrong. Cheating is cheating.
I did cheat in the game. It made me feel great to do it.
Just because it's only a game, doesn't mean it's okay to cheat. You are still emulating her likeliness and cheating on her, which can say a lot on what you want to do. Why not look into yourself and ask yourself why you want to do this to figure it out?