I am a WAW who came home to my marriage. FYI - no OM.
This is a poor theory being floated in here. In my case - and I'm betting in many others - the WAW already knows what she is missing. YOU! It's likely why she walked away - she couldn't have 'you'. Why would seeing you share yourself with someone else be helpful? Perhaps momentarily it would 'attract' her but it would be an anemic attraction.
I came home when I saw my H taking care of himself for his own sake. I saw him changing his communication style, to include listening, considering my perspectives, partnering with me on ideas, really SEEING me...now THAT'S attractive. And it doesn't hurt anyone. And it doesn't fertilize doubt. It's positive, lasting and HONORABLE.
If a guy uses one woman to make another woman jealous, he's objectified both of them. And if he thinks that's ok - maybe, just maybe, that is why he is a LBS.
As someone who traveled a long way personally to come back to my M, I am thankful we didn't have any additional hurdles to clear (dating other people) while putting this thing back together. It's hard enough without all of that.
Cheers ~
Me45 H46 T25 M22 S21 & 19 D13 Separated and filed 8/08 Moved home 11/08