Changes in intimacy—an increase or decrease in affection levels and/or sexual preference may indicate infidelity.
Suspicious phone habits, such as a spouse who hides their phone or is secretive about their call logs and text messages, may also suggest cheating.
Changes in appearance, such as a significant shift in style of dress, intimate wear, or personal hygiene, can be a clue.
Suspicious internet use can resemble phone habits a cheating spouse may be overly secretive about their browser history and general internet usage.
Changes in work routines may seem clichéd, but when a spouse suddenly needs to work late or frequently attend conferences, it can be a sign of infidelity.
Changes in bathing habits, such as a spouse showering immediately after coming home, switching cologne or perfume, or altering grooming habits, could be a sign of infidelity.