Dave - OMG we all need an outlet and a place to vent!! I'm think most if not everyone here has experienced something like that on one level or another!! I know I have! We had a period of about 8 years that was anything but a bowl of cherries! I think people in general have expectations that are not realistic. I've had a few couples in my own family (including cousins) break up after 20 years. Most of the time it was the wife who said "I want out, I don't love you anymore!" Not that I am biased, but the men (my blood relatives) were good husbands and fathers - didn't drink, chase skirts, or any other types of bad for a marriage behavior. Life is hard, relationships take work.
I have been with my significant other for 26 years, and yes there were times that were not very good. He became sick with a chronic illness and is now disabled - this is not how I thought my life would be - neither did he. This is the hand we were dealt, this is what I have to work with. It has forced me to go way out of my comfort zone and do things I had no idea I was capable of doing!! And do you want to know something? It has made me a better person, a more confident person, and someone who is willing to go out on that limb to pick the fruit even if I don't want to or feel like it (borrowed from Suzi's Mark Twain quote in her signature line).
Of course the two of you aren't the same as when you first got together - I would hope not!! Sometimes people do grow apart. Sometimes people need to do something that isn't part of the relationship - to have their own identity. What has helped me is being able to do other things to get away for a while - hours, not days lol. I do work outside the home (thank God) and I am working on other things also and have a side job that is sporadic. We don't have children, in a way that is good then it is not - but it is that way. I know the other side of the fence is no greener then mine, it just might be different - but the same thing.
I don't know if putting this out there on a public forum is the best idea I have, but there are a lot of people who read this and don't post. Maybe someone will think about their own life and relationship or someone who is close to them, and just maybe think about things a little differently.
Best wishes to you and your family.