Arrange a Personal Investigation on Your Spouse

First, the most obvious point is he/she no longer wants sex or makes excuses to not have sex.

Second, he/she suddenly has to work late and have all kinds of new obligations that take them away from home repeatedly or for long periods of time. Or they tell you they are working longer hours and discontinue allowing you to view their paycheck or pay stubs.

Third, he/she will not allow you access to their computer or they suddenly shut down the computer when you walk into the room. He/she may password protect their laptop or computer to keep out suspicious eyes. Or they stay up to "work" or "play a game" on the computer after you go to bed. Excessive internet usage, especially late at night, is a red flag.

Forth, he/she begins to put distance between you or show a lack of interest in what has been the routine with few, if any, excuses for the change in their behavior.

Fifth, he/she suddenly needs a cell phone or pager and you are discouraged from ever looking at it or using it. They also may make certain their cell phone or pager cannot be answered by you by hiding it or taking it with them wherever they go. They are secretive about their cell phone or pager bill and pay it themselves when you have always paid the bill in the past.

Sixth, If your loved one works with people, such as at a bar or restaurant especially as a waitress or bartender they might suddenly tell you not to visit them at work. This usually means they are hiding something at their workplace whether it is with a co-worker or a regular customer such as at a bar.

Seventh, he/she arrive home smelling faintly of perfume/cologne or another person's body.

Eighth, he/she arrive home and head straight into the shower or bath.

All above show your spouse is not honest, and cheating you now.