 Jason feels like he wants to argue. He wants to yell and scream, but when a problem comes up. You immediately solved. For some reason, he doesn't seem fond of this healthy relationship. So he tries to create a problem like cheating. But You feel like it's not a big deal since you won't even remember jason in a few decades. He doesn't know you're immoral. 

 "I tend to save my emotions for things that matter" you say. Continuing to eat. "so i don't matter to you!?" Jason yells.