What are some signs that someone is cheating?

@dragonfly46 exactly what my ex sister in law did.

@Holden That makes sense. I've said it before to the point where it sounds like a cliché, but people tend to project their own guilt on others and make accusations.

@dragonfly46 The problem with this point is it goes both ways. If it's from how you cheated, then they have reason to think you may be, and if it's from how they cheated they are projecting their insecurity. So it really only displays insecurity