When it comes to your partner cheating, I don't believe there are any definitive clues. He could be working late, or he could be cheating late. He could be dressing up for you -- or his mistress. That's what makes this type of thing so confusing and hurtful. When you trust your spouse, you trust his explanations. But there are always certain things that get our antennae up. They don't seem to change much over the years, though with the advent of technology, those little hints now seem to involve a lot more cellphones and social media and a lot less lipstick on the collar (unless you're President Obama). Here are 10 classic signs your guy (or your woman) might be cheating... FIND OUT THE SIGNS BY CLICKING THE PICTURE.