TIFU Checking my dashcam videos after a vacation

This happened a few years ago. This will be kind of long, but definitely worth the read!

I live in a place where people drive like they can’t die. After a few close calls I was inspired to install dashcams in both mine and my partners vehicles to have evidence of any future chicanery. They are great cams with front, rear, and interior feeds.

A couple months after I got them up and running, we went on a cruise for a week. Before we left, my sister in law asked if she could use our condo for a “mini girls trip” and told us she would be staying there with some of her girlfriends part of the time and just taking some me time for the other part. Her husband was working and taking classes and wouldn’t be coming with her, which will be important later. Magnanimous people that we are, we happily agreed and gave her all the details she would need to have a great stay, including access to our car.

Fast forward to a week after we got back from our cruise. The dashcam we have automatically records over old videos to make room for new ones, but on an impulse I decided to look over videos from when we were gone just to make sure nothing crazy happened while the SIL borrowed our car. As I was skimming through I noticed that the camera angle looked odd, and upon further inspection I saw that someone had adjusted the interior camera so that you couldn’t see the driver or passenger. As I looked at earlier videos I noticed that the arm that I saw on the steering wheel did not belong to my sister in law, but to a man that was not her husband. Audio and footage from the front and rear cam confirmed that there was some dude I had never met driving my sister in law around town.

Wondering why the fuck some random dude was driving our car without permission I asked my partner if she knew anything and she was just as confused as I was. All the videos from before the camera was moved had already been recorded over, but after looking a little closer and catching a glimpse of them leaving the car, she suspected it was a super toxic ex from years before. She called her sister to confront her about it. Since this was family business I stayed quiet and just listened, but this is where it gets crazy.

When my partner asked her if any men had been in the house with her, she said no just her and her girlfriends. When my wife brought up the footage, she caved immediately and admitted that her ex had been in our house with her.

We had gone to a family reunion in the town where my partner grew up, and apparently while we were all there my sister in law had reconnected with her ex. They had been talking for a couple months after she got back and they planned a little getaway. She lied to us about why she was using our home and this little scumbag flew across the country to come and stay with her in our house. There were there alone for 4 days and nights, and from what little I saw and heard on camera, they were pretty flirty while they were in the car. We even caught a glimpse of them holding hands coming out of a building on the front cam before they broke off to get in the car.

Sister in law swore up and down that they didn’t have sex and that he didn’t stay there, but there’s video of him getting inside our car late at night from inside the garage, which only opens from the inside or with the opener in the car. Obviously we were both pretty pissed about being lied to and about her using our house to cheat on her husband, who is the nicest guy and dotes on her hand and foot, basically worships the ground she walks on.

She told us that because since her husband had gained weight she didn’t find him attractive anymore, so she wasn’t having sex with him anymore and was starved for an orgasm. Remember, she also swore up and down that she didn’t fuck this guy that was sleeping in our house with her for 4 days, but that was her excuse for rekindling things with her ex.

We had gotten pretty close before all this happened and we both loved the guy, so my partner told her that she needed to tell him or she would. She also wanted to talk to him after she told him to make sure. She was pretty pissed about that and felt like we were boxing her in, but she eventually agreed. To this day we have no idea exactly what she told him, but when my partner talked to him the next day we could hear her in the background while he was on the phone, and he just said he was fine and didn’t have anything else to say.

After this, sister in law cut us off and hasn’t talked to me since. She will still talk to her sister occasionally, but usually only at family gatherings or when she wants something. Because I found the footage, she seems to have put all the blame on me and even accused me of being a pervert for looking back at the dashcam videos, which leads me to believe there might have been more damning footage that was recorded over before I got to it a week after. My brother in law has also cut us off, and I haven’t seen him in years because of this, which sucks because we got along really well. They are still married, but I still worry about him and wonder how he’s doing. Also, her ex paired his phone to our car as “coochi bandit” with that exact spelling, so there’s that.

TL,DR: I checked old dashcam videos and caught my sister in law cheating, now she won’t talk to us anymore

EDIT: her husband does know the general details of what happened. When my partner talked to him the next day he just seemed numb about the situation. SIL told him what happened, but she almost certainly spun it to make herself the victim. We’ve tried to reach out since, but he has ignored all attempts. He cut us off the same time she did.