The document discusses signs that a boyfriend may be cheating, such as being secretive with his phone, taking a long time to respond to messages, and working more or taking frequent business trips. It recommends running a reverse phone lookup on suspicious phone numbers to identify the owner, and looking for other evidence like questionable social media profiles or arrest records by doing a background check. Finding even one suspicious message may indicate more widespread cheating, so the document encourages using these tools to get definitive proof and understand who may be texting him.