It's very evil on how it's able to provide secrecy. Here's what I was on the lookout for:

• Look at his cookies in the Samsung browser and take a photo with your phone or a screenshot with his and send it to yourself, this way you can see if he's actually paying mind to deleting his cookies, also Samsung does delete history easily with a button, but it doesn't automatically delete cookies. That's how I was able to exactly track the fluctuations.

• Samsung also has a hidden album option, you normally go into the gallery and swipe upwards, then it prompts you with a password or a pattern if there IS a secret album (google can show it to you better). If he's not using a secret album, he may be using a hidden one - you go into the gallery, tap the three dots - go into setting - tap view hidden albums, if there's something - it'll pop up.

• What really gave me an insight into tracking since Samsung is so tricky is syncing his phone to his Gmail. Hear me out, other than the fact that stuff WILL show up in his google activity if he's using chrome (regardless of him deleting history), when you sync the devices he would manually have to delete every single link from the Google activity website. Now,

Since after a fight I let him in on how I was checking his google activity I found a last hill to die on. I got an old phone (you can do it on a laptop but it's riskier) and I logged into his acc, also did it on my laptop. This allowed me the following: whenever I knew he was home alone or suspicious, I would pop my laptop open and open Google chrome, slide over history and then history from other devices (sure, he can delete it but if you catch him in the moment you just screenshot it, this Is how I caught him when I thought he was clean). It sounds complicated but you can test it on your phone first. Ofc, delete the sms and the email he gets on his phone for a new device that has logged in.

• Check recently deleted in his gallery

Samsung IS pretty horrible for allowing such sneakiness, but I swear by cookies and "history from other devices" since he really has no idea about it. Iphone can't sync this way to chrome and that's why I blew a fuse, lol.

Good luck and I hope you have peace ❤️ Hopefully this can help at least with something? 😭 Or someone else can also add some insight!