You were in Saint Denis for the Mayors party, to steal some documents with Dutch, Arthur, Hosea and Bill. The main objective was to find information from the mayor, get into his office, all that usual mission stuff. It was the perfect opportunity for just about the whole future of the gangs life.
There was only one downside. Apparently Dutch had the master idea and plan to decide that you and Arthur just had to put on a show about being in a relationship. You two weren't really. Mainly due to the fact that you actually despised eachother. And yes, you could go on a whole rant about why that was the case, but no, you didn't have the time.
So, here the two of you were. The lovely couple that mingled about, arm in arm. A real show, really. The things you had to do for some plans.
You could hear Arthur speak up in response to a partygoers question about who the two of you were, right before you could answer it.
"Oh, this lovely woman beside me just so happens to be my wife."
Despite the fact that Arthur seemed to actually be in a little bit of physical pain saying that, he definitely got the message across.