Now I am the one not paying attention...

So I got caught not paying attention to my ADHD fiance the other day. For close to three hours she was either going on and on about some topic and then would switch to complete silence as she shopped online. It switched back and forth so much, and I was busy putting together something that I completely shut her off and gave her canned answers to make her think i was listening (i know - something out of a bad sitcom). Well eventually she saw through that and thanks to her knack of holding on to every. little. thing. ever. we are in the middle of a three day bickering session where every word i say or response i make is picked through for a bigger meaning. I'm usually pretty good with paying attention to her but I just got tired of it all. Any non-ADHD people out there get caught in this same problem?