I've discovered Clare likes to be alone.

"For fear you will be alone you do so many things that aren’t you at all."
--Richard Brautigan

"When you live with a woman you learn something every day. So far I have learned that long hair will clog up the shower drain before you can say “Liquid-Plumr”; that it is not advisable to clip something out of the newspaper before your wife has read it, even if the newspaper in question is a week old; that I am the only person in our two-person household who can eat the same thing for dinner three nights in a row without pouting; and that headphones were invented to preserve spouses from each other’s musical excesses. The hardest lesson is Clare’s solitude. Sometimes I come home and Clare seems kind of irritated; I’ve interrupted some train of thought, broken into the dreary silence of her day. Sometimes I see an expression on Clare’s face that is like a closed door. She has gone inside the room of her mind and is sitting there knitting or something. I’ve discovered that Clare likes to be alone. But when I return from time traveling she is always relieved to see me."
--'The Time Traveler's Wife'