I found out my [29M] wife [28F] has been cheating on me for the past two years and I don't know what to do.

First off, please forgive me if I'm not coherent at any point. I haven't slept properly in a few days now.
I've met my wife in high school when we were 17, and we've been together ever since. She was my first girlfriend and up until now, I thought she was the woman of my life. Clich?, I know. But in all our years together I only grew to love her more. She's the first thing in my mind in the morning and the last thing in the evening.
She has always been the only one for me, I never wanted anyone else. Ever since we met I've been madly in love with her. Yeah, I know how it sounds but it's just how I feel. But apparently, I was the only one who felt that way.
We've been together for ten years now. We got married a year ago, since we decided only to get married once we both finished our educations. I graduated last year and we got married as soon as we could.
This year has been the best of my life. Knowing that I was married to the woman of my dreams was literally a dream come true to me. Ironically, that changed about a week ago. Our work schedules don't align as I'm in the health field and she's in civil construction. Last Friday, she had to work and I ended up having the day off.
She forgot her phone in our house and went to work (she does have both a personal and a work phone). At some point during the day, I saw her phone lit up a few times and eventually picked it up thinking it might be some emergency. The messages were from I guy I didn't know. I thought it was strange as if this was a work contact it would probably be on her other phone. I know I should have stopped there and let it go. But I didn't and unblocked her phone to see the messages.
I'm having a hard time typing it out even now. I scrolled over their messages and all of them were devastating to me. She's been exchanging messages with this dude for about two years (when she got the phone) and they've been talking about many things.
They were changing sexual messages. Sexual pictures. Scheduling when and where they would meet. They even exchanged pictures of when they were together. This has been going for at least two years.
My heart is in shambles. I'm lost and I'm angry. I've been madly in love with this woman for ten years. While she was cheating on me for god knows how long. She married me while having an affair. She ****ing sent him a picture on the day of our marriage.
That was happiest day of my life and now my life is broken. I haven't slept properly as every time I close my eyes I see flashes of the pictures. I see images of them together. Every time she leave, I want to tear my chest open and rip my heart apart.
I lost and I don't know what to do. I love her so much and I gave her my all. But I wasn't enough and I'm so angry at myself. I don't know what to do now. How to move forward. I haven't told her I know and I don't even know if I want to tell her.
Right now, I just want this to me a nightmare. Please, anyone, please. I don't know what to do.
TL;DR: My wife has been cheating on me for a long time. I just found out and I'm lost and broken. I don't know what to do or how to move forward.


Source.

If she's been cheating on you for a long time then she isn't going to change, I would file for a divorce