No wife or husband would ever think that their signficant other would ever do such a thing. Its different for a boyfriend and girlfriend. but both situations can learn from these few steps i have to offer on if your being cheated on. And, trust me i am pretty sure i am right. cause a lot of my friends and their friends have tried it and yup they were being cheated on.
Step2
Look at relationship with your signficant other. Is it good or you having some problems? Is he/she always at work late or on the computer when they get home? Do they have more than one phone?(unless they are a doctor or in business...i really doubt they would need more than one cell phone) Check your cell phone bill. Look for repeated numbers and the days and times. And, also more importantly how long he stays on. Then, go over bank statements and credit card statements? Recipts are even better. Cause they give time and date. Now here where some detective work comes in. If they have nothing to hide they wouldnt put a code on their cell phones. Or, if they hide their wallet or purse. Then, their is the good old gut feeling. If you have those feelings 85% of the time your right.
Step3
Yeah i know it might seem sneak and stupid. I am just saving you from getting more hurt. You just have more to use against them. And have a reson to be upset or think about getting a divore. Just don't try to get even. Cause you will care that guilt with you everyday of your life and its not worth it.
Tips & Warnings
Make sure you dont get caught. It will just cause more questions.
You might end up fighting or thinking about divorce
Enthusiast 
