Way too often people don't recognize when they've crossed the line into cheating waters. It's easy to do if you don't know the warning signs. Here's one warning sign:
Flirtationship - Not a relationship, not really a friendship, but a connection with another person that has sexual tension.WARNING: a flirtationship is cheating.
Flirting is fine if you're not in any kind of relationship (the same goes for your flirting partner), but if you're married or are in a serious relationship, flirting with someone else is wrong (and very hazardous).