Posted in Web Is He A Cheater? 10 Unmistakable Signs He Is Cheating On You! October 31, 2020 Related: Top 6 Relationship Red Flags. Unfortunately there is no guideline that tells you exactly how to tell if a guy is cheating on you. Unless you either catch him in the act or he confesses, you can’t know for sure. Link: https://www.vixendaily.com/love/signs-he-is-cheating/