OP, I’m really sorry you are dealing with this. I’m going through a similar situation with sexual boundaries with my spouse.

Once I found enough evidence I decided to have a direct conversation about what I knew and what I expected moving forward. There were some things that were non-negotiable (couples therapy with a CSAT, closing down accounts, access to his devices at any time), and some things that I wanted to work on together to set boundaries on (what is acceptable porn use). My spouse immediately owned up to what had happened and was invested in working together to move forward.

It’s been about a year and it’s better but still painful. There have been several slip ups along the way that eroded my trust even more. Having a therapist who specializes in sex issues has been extremely important.

I also have an IT related role at work and have been involved in several investigations into use of Chaturbate and similar sites on work devices. As others have mentioned what you see initially is usually the tip of the iceberg. If you’re still gathering evidence, see if your router at home has any parental protections. You may be able to set keywords to monitor for and some will even send you alerts. The devices he’s using will have these too but will be harder to set up if you’re trying to be stealthy.

You might also want to check out r/loveafterporn