How to tell if your partner is cheating

People who are cheating “tend to engage in sins of omission,” Durvasula says. “They operate on a ‘need to know’ basis, which is not healthy for a relationship.” Although neglecting to mention that time they grabbed drinks with co-workers could be completely innocuous—maybe happy hour just wasn't that memorable—if the behavior persists, it could reflect general dishonesty, Klow says.