What happens though is a person who is being cheated on starts to question their self-worth, their personal value drops fast and they feel the need to start proving themselves to their WAS that they are good enough, the jealousy kicks in and along with attempting to prove their value (human nature dictates that we pursue value, we're always interested in better, higher value, etc.) the LBS tries to pursue with pleading, groveling, gift buying, dinner buying, doing extra tasks, "jumping through hoops", etc.

Don't do it is all I can say, it never works.

The quickest way to show higher value in all of these situations is to say "OK, you want the other person, GOOD! That frees me up to get someone better than you" and then actually follow through on this with casual dating, social interaction with other people.

You can't just talk the talk, you have to walk the walk.

The WAS expects the LBS to pursue,
when you chase something it will probably run away from you/evade you so you do what's counter-intuitive to bring a WAS back, you move in the opposite direction, you "run away" from them and then they question themselves, what they've done, why the LBS is moving away so quickly. So the lesson here is not to chase the WAS, in fact do the opposite, leave them or kick them out. You pull them in and they push you away so stop pulling them in, push them away and they will try to pull you back in. Gucci has said it hundreds of times on these forums: reality shows that the person doing the rejecting is the one being pursued, if the WAS rejects the LBS, the LBS pursues the WAS, change things around, the LBS should become the WAS, agree with the WAS and their decision to be with another person and then start dating other people and reject the WAS and push them away while the LBS moves in the opposite direction of the WAS and observe what happens then.