Hidden internet

I'm seeking some advice. I recently ended my relationship with the father of my children after four on-and-off years. Throughout our time together, we've faced several issues, including his persistent pornography use, adding other women on social media platforms like Facebook, Instagram, and Snapchat, and paying for local girls’ OnlyFans accounts. I discovered that he has been spending hundreds of pounds on sex cam websites while I’ve been home with our kids. My biggest concern, however, is something that keeps troubling me. While I was looking through his work laptop, I found email receipts for live webcam sessions, but I also noticed a recent Google search for the "dark web." I don’t know much about it, but after some research, I learned that it can involve disturbing content like illegal pornography and drugs. It seems complicated to access and requires downloading specific software. However, I don’t have any evidence that he actually explored this, as his browser history was deleted, leaving only his recent searches. Given his significant pornography addiction, I can't shake the feeling that the worst is possible. I'm not inclined to involve the police unless I have clear evidence of someone being harmed, but I keep hoping I'm mistaken. I mentioned my concerns to him during our breakup, and he dismissed them, calling me ridiculous. Is there any way I can have someone look into this without concrete evidence? He primarily uses his phone, which I can't access, and he also has a VPN installed. I really don't want to falsely accuse anyone, but the thought continues to linger in my mind, and since we no longer live together, I have no way to investigate further.