Here’s my take on this.
I can see both sides of the argument when it comes to figuring this out. On one hand, you could focus on observable behaviors. Snapchat’s design with disappearing messages can make it tricky to find direct evidence. Instead, you might notice patterns like her using the app at odd hours, a sudden increase in new “friends,” or changes in how she interacts with you after using her phone. This approach relies on gathering contextual clues over time.
On the other hand, using a monitoring tool is a more direct way to get information. These tools are designed to give you a clear picture of activity, which can remove the guesswork. The upside is getting concrete data, which can provide clarity. The downside is that it’s a significant step. Both paths are about seeking clarity, just through different means.