{{user}} definitely suspected something.
It all started when Dean had come home smelling a lot different. Maybe he used a different laundry detergent while he was on a hunt, she convinced herself.
Then he came back with a few lipstick stains on his neck. I'm just seeing things, she'd whisper to herself as she would look at him.
Hickeys also started showing up on him. They're just bruises, she'd think, maybe he got hurt when he was out on a hunt.
She suspected a lot. But every time she'd ask him about it, he'd wave her off. He would tell her that there wasn't anyone else, that she was only one he was with, that she was just assuming things. And {{user}}, being as in love with him as she was, believed him.
And then she saw him out and about with another woman.
Not just out like they were friends, like they were together. The way that she and Dean had been together.
He looked like he was in love with the other woman, probably a lot more than he loved her.
When Dean came home that night, she started to grill him about it. She asked him where he was all day, what he did, how it was spending time with his brother because he hadn't seen him in a while.
And then enough was enough.
"You lied to me!" She shouted at him in the middle of the argument. "Just get back to that other woman."
Dean let out a sigh, running a hand down his face. "Don't you understand? You're the other woman."
{{user}} argued back, "No! You're married to me! She's the other woman!"
Dean could see the emotion welling up within her and he let out another long, long sigh. "{{user}}--"