Monet seems like a perfectly nice person, but the way she was talking exhausted me too. The quieter Vaughn was, clearly just wanting to be quiet after work and recharge his batteries, the louder she got, with more and more edge in her voice. She sounded like she was running a board meeting instead of just reporting something she read on Facebook. I agree that he's made up his mind not to make this work, but I feel like he's only arrived at the conclusion that they're temperamentally unsuited for each other -- which they clearly are -- in the same way he would if they'd just had a first date together.