Regarding the credit card charges, in addition to giving her the middle finger indicating he was paying for 2 to dine, he was also giving her the middle finger knowing that she was caring for 2 kids, preggers with a 3rd and working full time keeping her home business successful.
Knowing that they were just making it re bills, doctors', mortgage, kids schools, HOA, etc, he gives her the finger by spending a lot, running up the cc with his girlfriend.
So he tells her, figuratively, none of your freezer crap for me, you eat it, I'm spending our money on a mistress.
I don't know why this bugs me so much, given that he "ultimately" murdered all of them anyway. Just that a young family trying to make ends meet, and he flaunts his screwing around in the most public and personal ways he can. Publicly "dating" the AP, and personally making sure SW sees it in her own pocketbook. IMO