I wouldn't have picked the fight over the toilet paper. You were being nice and helping, you had an opportunity just to be a nice guy all around, and that little comment soils it. Instead of a shining moment, it'll have a little ding on it now. I do the exact same thing, though!
Good for you for setting boundaries, and calmly agreeing to them.
Funny about memorabilia. W moved out back in June - a few weeks ago, I was cleaning and found a bunch of cards I had sent her, including a postcard I had sent her like the first week we were dating.
I called her and told her I had found them, and I was going to throw away unless she wanted them, and she told me to keep them for her to get.
Weird, separated for 2 years, moved out for 6 months, I have no desire to be with you, never want to be around you again, our marriage is crap - but you want keep memories of our relationship?