I think MrsHD is jealous, but she keeps it buried and hidden very well. I'm going this weekend to NJ for reunion of the American school I attended in junior high in Argentina. I asked my wife if she wanted to go and even talked about taking the kids to also visit NYC. But I decided the whole family would be too expensive and us two could just go. She did not want to leave the kids and also said school reunions were "not her thing" (meaning that she never went to a reunion of her inner city high school). So I let it drop.
Then I went to my 30th high school reunion a few weeks ago, but did not bother to ask her to attend since I would be staying at my mom's (with whom my wife can;t get along) and she had already stated that reunions were "not her thing." I hadn't seen many of those people since high school so it was good for me to get in touch with them and I had a good time.
But later I could tell she was acting hurt, but not wanting to ask about the reunion, rather implying that I must have hooked up with an old girlfriend. I told that that my HS girlfriend was a year younger and therefore not at the reunion and my college girlfriend was from a different town. I told her it was ok for her to be jealous, that it meant she cared, and she should not be ashamed to admit such, but she has some idea that admitting to jealousy is a bad thing. She did not argue back the point with me, telling me she knew I was speaking the truth about how she felt, but she would never admit to it.
I think MrsHD plays the same mind tricks on herself.