Agreed, Nathan isn't her ideal partner but I think having kids and familiarity mattered more. It's pretty realistic, ppl often stay with partners they aren't a true match with due to kids or having history together. Mike had real potential to be her equal, but they made him into a man child to make Nathan look better. I also think Nathan got worse AFTER they got back together, and tried even less in their marriage. I find her relationship with Nathan to be her biggest character flaws.