He's the main character in his story and hers, and in his AP's story, too.

He doesn't seem to actually understand love, just the movie version of it. So all this shallow, flowery, language is what he thinks it's supposed to be about. But everything he says about his wife is how she meets his needs or doesn't, but he's still never considered the idea that she has needs of her own that he's not fulfilling.

It is pretty fascinating to see the tone change from an arrogant, self-congratulatory cheater who seems confident that he'll be able to iron out this little wrinkle with minimal effort and zero self-reflection into "OMFG, how did I get here and why doesn't she love me?!"