Perhaps he did it again because maybe he hoped. Maybe he was attracted to his wife and wanted to reach out. Maybe there was hope because they have had sex since the incident before.
I think this is exactly right.
Well, the "hope" part is definitely correct. But associating it with the fact that we had sex back in May somehow changed the "rule" is not right. Yes, I hoped she would react with a moan of pleasure, rather than a "WTF?" But there's no reality in our history which would suggest that such a positive outcome would occur, beyond the very early days of our sexual relationship. Hope springs eternal? Or, "shake the cage and create some conflict?" Or, "just a quick squeeze to see if it still feels wonderful and hope she doesn't wake up?" Maybe some of all of those...maybe something else.