Thank you both for the thoughtful advice, much appreciated. I promise, it isn't a medical issue but it's just that I don't feel any excitement or magic for the marriage anymore and that's a very selfish feeling of mine since she is a great woman and even better mother to our kids. When I first brought up a couple weeks ago that I wasn't feeling great about "us" she seemed legitimately shocked which surprised me. I assumed we both were relatively unhappy in the marriage but were holding on because we are great parents and love our family unit.

So now I am just thinking even more selfishly (I know woe is me, I'm a big boy, I should be able to handle it).