What is your "accidently caught your spouse" cheating horror story?

We were on a break after a 9 year relationship (started dating when I was 16).
I left everything I owned at our place and I moved in my parents spare bedroom.
During the weekends we'd do an activity and see if the fire could spark back up for her (markets, parks, dinners..).

Fast forward 3 weeks and I get a notification on my PC at work "6 new photos and 1 movie added to Dropbox"

In the photo's I saw my bedroom, my bed, my girlfriend and a dude that wasn't me.
Left work instantly to confront her and she tells me he's 21 and she met him in a bar with friends.

I didn't believe a word she said so I took 1 of the photo's, shared it on my facebook with 100 mutual friends and after a police visit I found out it's a 17y old student from the school she's been a substitute teacher at for 3 months.

That shit costed me my dog and two years of my life to learn to deal with it.

/r/AskReddit Thread