In my game, I am playing a romance sim and she's cheating on multiple people, but there is no memory of cheating, only that she kissed/woohoo'ed multiple people. Is this a problem?

Is she engaged or married? Because if she's not, she's not technically "cheating" on anyone..

No she isn't, I thought that being a relationship and seeing other people was considered by the game to be cheating, since that's mostly how it's seen in real life. I could be incorrect though.

Without a "No Jealousy" hack, a guy WILL be mad if he catches a girl he's in love with 'woo-hooing' with another sim. But unless they are engaged or married, it's not actually cheating. It's like she's saying, "Well, we never said we were exclusive", and he knows it's true. He can be mad all he wants, but he knows it wasn't cheating since they weren't exclusive... In this game, meaning engaged or married.

If you're engaged or married, you get a "had affair" memory the first time you engage in a romantic interaction with someone other than your SO. If your SO sees you engage in a romantic interaction, you will get a "caught cheating" memory.

The person you're cheating with will probably get a "met SO" memory and nothing else. Even though what he technically met was the SO's fist in his face.