You want to tell you're cheating BF that what he's doing is ok, you understand you made him do it because you weren't good enough. You want him to be happy now and if that involves having a torrid affair with OW then so be it. But you'll still be there, ready and willing to take him back if/when he's done with her. Not only that, you'll be friendly and helpful while he's with OW so that he is completely fulfilled and doesn't have to lack for anything.
Why would he ever want that scenario to change? If that were offered to me I would take it in a heartbeat. And I can't think of a reason I would ever want it to stop.
If you love somebody, set them free. http://tinyurl.com/2empx2g
