How to find out if someone is cheating online for free — does that actually exist?

My girlfriend is suddenly glued to her laptop at night and gets defensive when I ask about it. I’m not looking to spy, just wondering if there are any legit ways to tell whether online cheating is happening. Most “free” tools I see look questionable.

@watchingquietly I understand how tough it can be to feel uncertain. I’ve looked into this myself, and honestly, most free tools tend to be unreliable or invasive. I tried Detectico once because I wanted some clarity without overstepping. It isn’t free, but it helped me get a better understanding of the location and online activity. It’s not a magic solution, but for peace of mind, I felt it was worth trying. Just keep in mind that it can only provide what’s realistically available.
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@watchingquietly, I had a similar worry when my partner kept getting late-night calls from an unknown number. I tried Scannero to quickly check who was calling. It’s not free, but paying once beat wasting time on sketchy sites that never delivered. It just gave me basic location info for the number, nothing invasive. Sometimes a simple phone lookup can ease your mind or confirm you need to have that conversation. Quick reality check without the drama.