LBH w/ a WXW after the D - now what

[gs9]

Hi all,
I've taken a little break from being on here. I found I was obsessing and spending too much time here and thinking about her. The last week has been nice. I've ripped out a bunch of old carpet, bought new carpet and it will be installed this week. Also, my parents just arrived last night and will be staying for a couple weeks with me. Should be a big help around the house.
I have a question
WXW has taken a couple shots at me over the last week but nothing huge. Mostly just throwing in "your girlfriend" statements. I've ignored all of them. We had a D4 exchange last night and it was very quick. We didn't speak a word to each other. Today she sent me a text that says "Yesterday it seemed like you may be upset with me. Did I do something to upset you?"
I'm not sure if I should even respond. She didn't do anything yesterday to upset me but she has been doing things for years that she has never apologized for and the last 8 months she upped the ante by sleeping around, lying, throwing these A's in my face, treating me like garbage and D'ing me.