7-year itch. How many of us had things start to unravel at the 7 year mark? I bet a lot!
Truth is, you can't take her back until she is ready to fully change and recognize what she's done to you. honestly, you don't want her back until that happens...
You need to focus on you until she has proven (actions, not just words) that she is ready to really try and make things work. That starts with intensive counseling with a good counselor; one that supports marriage and applies MWD's and Gottman's principles.
Until then, you do you, man. setting boundaries will get you respect back faster than anything I know of. It gets worse before it gets better, but boundaries work.
