The Top Ten Signs That Your Mate Is Cheating On You:

 1. Changing attitude toward your relationship: more argumentative, critical or distant -- less affectionate -- increased need for "space" 

2. Unexplained absences: staying later at work -- leaving the office for lunch more often -- spending more time "with friends" or pursuing a new hobby during evenings and weekends --frequently off running lengthy "errands" 

3. Increase in personal expenses: seems to go through pocket money at a faster rate -- credit card spending jumps 

4. Changing telephone use patterns: spends more time on the phone -- seems anxious to be first to answer phone when it rings -- mysterious incoming calls, hang-ups, "wrong numbers" -- suddenly "needs" a new cell phone (plan) or pager 

5. Greater attention to personal appearance: begins a crash diet or exercise program -- trendy new wardrobe, fragrance, hairstyle or nails 

6. Added interest in the mail: wants to limit your access to it, especially phone bills, bank, and credit card statements -- personal letters (but probably not postcards) from a long-lost "friend" or "relative" 

7. Articles of unknown origin: slips of paper with names, phone numbers, dates/times/locations stashed in pockets, wallet or purse -- receipts showing unmentioned purchases -- matchbooks from unknown bars or restaurants -- strange cigarette, gum or food wrappers in vehicle 

8. Mysterious bite marks, bruises, scratches, skin irritations: can't explain how "that got there" 

9. Changing sex drive: decreased interest in sex -- more aggressive/hostile during sex and less tender/romantic -- newfound knowledge   regarding a previously unexplored technique or position 

10. Unexplained odor or stain: comes home smelling of cologne or tobacco  that is clearly not their own -- lipstick on shirt collar -- stained clothing 

QUICK SIGNS OF INFIDELITY

• Lipstick on collar

• Noticeable odors of colognes or perfumes on shirt/blouse

• Wearing new underwear when for a nigh out

• Secretion stains in underwear

• Phone numbers on pieces of paper

• Condoms or other birth control devices

• Viagra or other such products

Things to monitor:

• Normal mileage on vehicle changes, time they leave and return from work, unaccounted for vacation or sick day use at work.

• Unusual home telephone calls (i.e.-whispering or abrupt hang-ups).

• Time on Internet and in private chat lines

• Cell phone conversations and cell phone bills (calls to the same number over and over without explanation)

• Obvious attitude change and unusual interest in coworker or "new" friend.

 Two Options if you Suspect Cheating:

1.   Surveillance with/without Video 

2.  Ask if he/she is willing to take a lie detector test (least expensive option)