Yeah I read your thread and he isn't being fair but none of our sitchs are. Did you read where mine has told me repeatedly that I'm prettier and more fun? He also admitted to me that he doesn't talk about their R and her good points to spare my feelings. So don't believe any of it. Plus who's to say he ends things and he doesn't want to come back?
An A is a symptom not the problem. If she left the country tomorrow, there would still be problems between you two. What were the things that were issues between you before you split? What would you want to see changed and what do you think you need to change? It's easy to fixate and blame the outside person.