I don't know about your wife but is it possible that she feels just as bad about the situation but can't figure out how to change it??
Hubby and I have been dealing with this situation for a few years now. We have been married for almost 20 years but only in the last 3-4 years it has been an issue. He is a amazing and we discuss this on occasion. I fear that he will one day have an affair because of my lack of sexual desire. He always reassures me that he loves me for way more than sex and it will never happen. I was sexually abused by 2 different very important men during my childhood, teen years, and it didn't stop until I got married to hubby.
Since doing trauma working with my therapist huge issues regarding sex have surfaced. Now pretty much every time I have sex I get flashbacks. I usually end up in tears (most of the time I hid it so he never knows) then you add psych meds which also cause sexual issues and this is a major issue for me.
Is it possible there is stuff going on with your wife??