I recorded my wife chëāting on me and I can't stop watching it-Man cries out

A couple weeks ago I decided I wanted to surprise my wife with a kid-free night out. 

My parents live about an hour and a half away from us and l arranged for the kids to stay with them for the weekend. Usually, when I go to my parents I am gone until later in the evening. We spend all day there and leave around dinner time. This time, I was dropping the kids off and immediately going home so I could surprise my wife and we could go out as soon as possible. I had made reservations at a nice restaurant and was hoping to go to a few places for some drinks first.

 I left at 8:30 and was back in our housing plan before 12:30. As I pulled onto my street I saw a truck parked in front of my house. I did not recognize it.

 I assumed it was someone seeing the neighbors though because it's not that unusual for someone to park in front of our house. I parked a few houses away thinking l would sneak into the house and surprise my wife instead of pulling in the driveway and going in the garage. I went in through a basement door. I was as quiet as possible but as s0on as I walked in, I heard her making sounds from the floor above.

 When I first heard it, I thought she was just by herself, maybe having some personal time. I didn't want to interrupt her privacy and embarrass her so l was going to go back to my car and just go in the garage so she would know l was home. Then I heard a man's voice l immediately felt sick. 

My heart felt like it was going to explode out of my chest. It is hard to describe how I felt at this moment, I decided to go upstairs. I had no desire to confront them, I just wanted to see what was going on. I moved slowly and quietly and went up the stairs. 

The door was halfway open. The kitchen was empty but I could tell they were in the living room. It was obvious what was goin on at this point by the sounds. There was no way for me to look in the living room without them seeing me. I pulled out my phone and opened my camera app. I put my phone just around the corner of a wall. I could see my wife with a man I didn't recognize.

 I won't go into detail on what they were doing but I think you can figure it out. I started recording it, I was thinking that I needed a record of it for whatever I decided to do in the future. I just stood there in my kitchen, watching this all unfold on my phone screen. 

l felt like l could just scream at any moment but for some reason I just froze completely. This went on for several minutes. She finally jumped off him and made a comment about going to the bedroom and they went upstairs. She even made a comment about how much time they had left.

 I walked into the living room and found the guy's pants. I took his wallet out and took pictures of his driver's license. I know his name and his address now. I've never met him I have no idea how my wife knows him. I left the house the same way I entered. I went back to my car and cried like the pathetic man l am.

 I decided to watch the video to make sure it was recorded. I watched it all. I sat in my car for at least half an hour. I couldn't drive to my parents and get the kids as I would have to explain why. I decided that I would pull in the driveway, open the garage, and just pretend like I was there to surprise her. I took my time getting into the house. I made a lot of noise.

 When I saw her she was very flustered asking me why I was home, etc. She was in a robe and said she was just getting ready for a bath. I told her about my plans and she seemed excited. She poured us both a glass of wine and said we should pregame before getting ready. I don't think I talked much really.

 She took me into the living room. I'm not proud of what I let happen. I could faintly see the guy sneaking downstairs and going to the basement stairs but I didn't say or do anything, l just let my wife continue doing what she was doing to me. Since that day, I have watched the video of he repeatedly.

 I can't bring myself to make any decisions on what I should do next. She seems to know something is wrong with me because she's asked a few times if l'm ok. I feel worthless and every time I hit a low point I watch that video again. I feel like I've watched it at least 10 times a day since I caught them. What should I do?