There are lots of signs that you should be looking for in your spouse if you suspect an extramarital relationship brewing, or even happening right under your nose. There are always the classic signs like new excuses to stay away from home longer such as longer work hours or surprise meetings, and weird phone calls of their cell phone late at night that are constantly the wrong number. But what about the less commonly known signs of wayward spouses?

Watch their eyes - Most spouses will lie about where they've been or who they've been talking to if they are involved in an extramarital relationship. Many experts you can almost certainly tell a lie by the direction of the eyes. If you ask your spouse a question and their eyes move up and to their left or just straight to their left, they're probably lying to you. That's a sign of visual or auditory construction, meaning your spouse is trying to make up a story to tell.

Daily Behavioral Changes - Most people are habitual, not in terms of having a lot of habits and such, but meaning that their daily lives follow some sort of routine. A cheating spouse will often deviate from their routines, a lot of the times being completely sporadic and seemingly unorganized. This is a sign of an extramarital relationship that is often overlooked but is usually very plain to see.

Eating Habits - Have you noticed that your spouse asks you to cook food in a certain way, or they now complain about your cooking and they never were concerned with it before? Your spouse may be becoming more accustomed to his or her lover's tastes. A spouse involved in an extramarital relationship will sometimes have a "change in appetite" as well. They may come home already full, or may put off eating with you at all so they can go out with their lover. Another common sign of infidelity, but it often goes unnoticed.

Now there are a couple of signs that you might not be able to see because your spouse will go to extensive lengths to keep their actions hidden. Cheating spouses will use cell phones and computers to keep in touch with their lover, but it won't be so easy for you to uncover it, unless you have some expert help on your side. If either of these are a possible factor in your spouse's unfaithful activities, you should consult with a computer hard drive forensics specialist or a cellular forensics specialist.

These experts will be able to expose anything on either of these devices that your spouse has deleted or erased as an attempt to try and maintain the secrecy of their extramarital relationship. Usually, these forensics specialists work alongside a private investigator and the reports that you will receive back will be extremely detailed. An examination of a computer hard drive will turn up email conversations, website logs, instant messaging logs, and anything else that may have been erased. A cellular forensics examination will reveal deleted text messages, deleted pics, caller ID logs, and whatever else your spouse may have deleted from their phone.

It's worth a shot to hire a private investigator to conduct an infidelity investigation of your spouse is you have even the slightest feeling that they might be having an extramarital relationship. Maybe you're just being paranoid. Then again, your suspicions might well be true. You owe it to yourself to find out.