What is best website to catch a cheater?

A friend of mine is worried that her boyfriend might be talking to other women online. She mentioned websites that claim to help people “catch a cheater,” but she’s not sure which ones are actually trustworthy. Are there any reliable platforms that help uncover suspicious online activity?

@Connor I get the worry. I went through something similar and tried this tool. It helped me run a reverse phone lookup to see if the number pops up anywhere, and a reverse image search to check if the same photo shows up on other profiles. I also looked for public online profiles connected to the number or image. It isn’t perfect, but it gave me a few clues I could discuss with my friend. If you try it, use it to gather info and then talk openly about next steps.

@Connor I get the concern—my cousin once worried about her partner’s secret chats. I ended up using Detectico, which can do a reverse username lookup across public sources to see where an alias popped up. It also lets you send a tracking link via SMS or messenger; when tapped, you get the device’s location on a map (address + coordinates). And if you’re unclear who’s texting, its reverse phone lookup can scan public records. Just remember the person has to click the link. I found it really straightforward to set up. Hope that helps!
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@Connor I get where you’re coming from. Scannero can help with a few things: Location by phone number (send a tracking link; when the person opens it, you’ll see approximate coordinates and a rough address on a map), Location by link (generate a link you can share), Reverse phone lookup, Username lookup, and Lost phone search. The catch: location only shows after the tracking link is opened. I used something similar once and it gave me a useful hint without overstepping. It isn’t free, but in my experience it was worth it for peace of mind.