Try to talk with Jenna.

After Karen's description of Jenna's behavior at the club, you realize this is serious. You've done nothing wrong, but since when is that important.
You head upstairs. The light from under your bedroom door tells you that Jenna's awake.
You rap lightly on the door. It's your own goddamn bedroom, but you still knock.
"Baby..."
"...... what?" her voice is flat.
"Come on, Jenna. Can we talk?"
".... I'm tired, James. We can talk in the morning."
"Baby, please. I don't like going to sleep with something between us like this. It doesn't feel right."
A few seconds go by, and the light under the door changes as she opens it. The light in the bedroom is dim, but you can make out her face clearly enough. It's clean of makeup and her hair is tied back in a ponytail. She's wearing a silky pair of pajama shorts and a loose fitting white t-shirt.
{if JennaWarned = 0} "I'm sorry I didn't tell you about inviting Kayla. It was a boneheaded move. I was... I was just trying to get us all past Frank, you know? Kayla's not going anywhere, so I just.... I wanted us all to get along."
Jenna's face is set in a frown.
"Are you fucking her? Tell me the truth, James Sinclair."
"No... I'm not fucking her, Jenna."{else
} "I'm sorry for whatever I did to piss you off. We can talk about it, right? Aren't we husband and wife? Haven't we been partners for twenty years?" {endif
}
She stares at you for a little while.