- Changing habits
- Leaving the house early and returning late
- Business trips
- Holiday or family event absences
- Excessive overtime
- Unexplained spending
- Secret accounts (Instagram, email)
- Hidden credit card bills
- Extra grooming
- Scent of someone else (typical lipstick on the collar)
- Buying gifts you haven’t seen
- Unexplained items – condoms in the car are a giveaway
- Joining a gym
- Missed calls from an unknown number
- Coded or secretive text messages
- Less sex
- Evasiveness or defensiveness
- Obvious lies
- Prickliness or short temper
- Hate surprise visits (your unexpected arrival may come at an inopportune time for a cheater)
Read more at source.