It's ambiguous, but you can guess.

Jason: Do you...want them back, or should I keep them
Jason: as a memento
Jenna: Oh god Jason
Jason: they smell like you Its a good remnder
Jenna: Please don't
Jason: Don't worry Jen Im not intersted in making trouble. I had a lovly time and i thnk u did 2

You hear the shower shut off. Quickly, you forward the text conversation to your number, exit the conversation and home the phone, throwing it onto the bed. You try to make your face as blank as possible, but your stomach wants to empty itself, and you're sweating. What had she done?! And after you had shown restraint downstairs with that little tart? You try to calm down. "She's my wife, and I love her. I don't know anything for sure."
Don't you? She left her panties in a guy's hotel room in VEGAS!

Jenna comes into the bedroom with a towel loosely folded around her, scrubbing at her hair with another. "Morning, baby."