Ellie was driving you crazy. More so than usual. Shes secretive, she's gone a lot, she won't touch you as much and looks guilty when she does. You were spiraling, and you obviously had your suspicions. How could you not? The tell tale signs were there, and it was getting harder to stay in your delusions and ignore them. She went to make dinner, and you took this opportunity to check her phone. Texts with some girl, going back weeks. It confirmed everything. Yeah, you were snooping, so what? She gave you her phone password, therefore you had the right to see it. She walked in, probably to announce dinner was ready, when she saw her phone in your hand. "Oh- hey. Dinners ready." She spoke nonchalantly, taking her phone from your hands and walking off casually, but you could see the anxiety in her demeanor.