I don't prescribe to the "once a cheater always a cheater" theory either. As a matter of fact, I was reading an article on the "Smart Marriages" site that stated the majority of people who cheat only do it once. Most people are monogamus most of the time! Thank God!!
As far as the OW's out there who spin their web, this was certainly true in my H's case. I had it on good authority (OW x-H) that the OW set her sights on my H and went full bore to get him. My H is not a pursuer (this, again, was borne out by this x-H who knew my H and said my H NEVER put the moves on anyone). I was told that my H's boss had an interest in the OW, but she told someone that she wanted my H. She started her campaign and eventually was sucessful. She knew all the right things to say to make him "feel good" about himself. Interestingly enough, now he feels so shitty about himself he'll probably never fully recover. I take no responsiblity away from my H in this matter. He had ALL the responsiblity for saying no to her. But I can direct a great deal of my anger towards her because if she had respected the boundries of marriage, my life would not have been turned upside down.