Ask her. If that doesn't work, then have someone follow her to see what she's up to. This may sound like you are invading her privacy, but I'm a woman, and I say find out any way you have to. AnswerBe sure you aren't overly jealous. Some signs of a wife cheating are: going out constantly and not telling you where she is going; staying out all night and saying she is staying with a girlfriend (this could be true to a degree depending on where she and her girlfriends are going, because if one plans to drink more than usual, staying at a girlfriend's house is a good idea, but she should leave you the phone number in case of an emergency); not contacting you if you work shiftwork and call home and she's never there. hiding her cell phone; lots of instant messaging.
Accusing someone of cheating without proof is dangerous ground. If you have good reason to think your wife is cheating then I suggest you do as the above poster recommended and hire a detective to follow her. Better yet, follow her yourself. I did this with my first husband and caught him red-handed! I find women harder to figure out re cheating than men. After all, women have more excuses, such as meetings regarding school-age children, or perhaps a club she has joined or shopping or going out with the girls for the evening, etc.
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the best way is see how far it is from the house to his or her work, and everywhere else he or she might go grocery store his or her parents etc.. then check the milege meter on his or her car and yours before you go to bed, and if it changes, then ask him or her if they went anywhere that night, if she or he denys it, then she or he cheating, or buying you a birthday present. so if you constantly find unexplained miledge on the vehicle, then you know she or he is up to something. then you need to follow them or tell them how you know they are doing something bad. but you better be 100% sure they are cheating, because if they are not, then you will ruin a perfectly good marriage for nothing. get evidence. pictures of the persons house he or she is going to.
If you haven't been cheating and you have a gut feeling or your instinct is telling you she did. Trust your instinct. But if you've been cheating don't trust instinct cause your just turning it around inside your head.
There are usally signs, for example: * She is to tired to have sexual intercourse * She is busy, telling you she has a "yoga class" or she is always going out with her "girl friends"