Is Cheating Just a Symptom (and Not the Cause) of Declining Relationships?

Does infidelity predict an unhappy relationship? Or is it the other way around? Can a relationship recover after infidelity? 
In a recent study published in Psychological Science, researchers found that relationship functioning starts to decline before infidelity happens and that, in most cases, well-being did not recover in the years following the infidelity. The lead author, Olga Stavrova, a researcher and professor at Tilburg University, explains these findings and elaborates on how they can expand our knowledge about the dynamics of romantic relationships. 
To read the transcript, see here.