Let me get this straight. She cheated....you confronted her and she laughs in your face. Then what? Rinse and repeat?
Has she had any consequences in the relationship with you, due to her cheating, lying, etc.? Have you separated, stopped sleeping with her, or enforced other boundaries?
I agree that she disrespects you terribly. You have put up with her terrible treatment for 7 months. Why are you begging, pleading and fighting with someone who doesn't want you? I mean, even if you love her, why do you want to be with a woman who doesn't love you? I'm just trying to find out what type of man you are, and how you feel about these matters.
I am a former wayward W. So, I will tell you upfront that waywardness comes from a lack of respect. Your W doesn't respect the MR, and she doesn't respect her H. Maybe this has been building (her failing respect for you) and you just ignored it. She will not be that loving woman you once knew, until she feels respect for you as a man. As long as you are willing to live with whatever she dishes out, nothing will change. Most of all, her heart will not change. Her treatment toward you will not get better. She will go from man to man, and expect you to continue financing her lifestyle. She'll throw you a few crumbs every now & then, just to keep the money coming. But the weekend trips will get fewer and fewer.
You have a very serious situation, but there's a chance the M can be saved. You need to do a lot of reading that is provided in the Newcomers forum. Have you read everything Cadet posted on his page? It has valuable information that will help you get started DBing.
Post every chance you get. This will likely get worse before it gets better, but this is the best place to be during such a time.
It is not about what you feel should work in your M. It is about doing the work that gets the right results. Do what works!