Cheater Levi x wife reader

The triggering gets worse..

(Authors pov)
Once you got all of your shiitake in your car, you opened the garage and drove off. "I don't know where I'm going but, I'll ask Petra if I can spend the night". Y/N said to herself
(Third person pov)
You dialed Petra's number...Rinnnng...Rinnnng..."hello" Petra said groggily.
We're you asleep Y/N asked?
Yeah, but I'm awake now. Petra answered
I'm sorry. Can I stay at your house tonight? Y/N asked
Of course, did something happen with Levi? Petra asked
I'll tell you when I get there. Y/N said

~Time skip because author-San's hands hurt~
(Third person pov)

Y/N knocked on her door twice before you could knock a third time petra opened the door with a slight smirk, but when she saw you it disappeared.
Y/N wondered why that was....
Petra let you in.
When you got in you sat your stuff by her stairs. You took in your settings just looking at her house. It's not too big, or too small. It's just right for a small family.
Y/N heard small footsteps coming towards you. A black haired little girl came running towards Y/N and she said "Hi wady" with a cute baby  voice. But something stung You at the back of your mind...it said she looks just like Levi, the black hair, the grey eyes, but You pushed it away. The thought kept
Coming back.
Petra interrupted your thoughts and said "this is my daughter Lexi"
Y/N suddenly felt a pang in your chest.
Y/N changed the subject... she said I didn't know you had a child, when did this happen?
"A year ago" Petra answered
Y/N got extremely triggered. A year ago....that how long Levi has been cheating on Y/N
Petra asked "can I tell you something?"
"Of course" you said.
Lexi is Levi's daughter....Levi and I have been having an affair for the last year of your marriage.
Y/N was extremely enraged, but Y/N just took in a deep breath and quickly got her stuff and threw it in her trunk.

She called the only person that hadn't betrayed her.......Her childhood friend Erwin.....