I have to question that quote a bit ... many of us here show up w/ wives saying "I don't feel attracted to you any more."
I think there is a strong conscious and subconscious connection among the identities you list: - good man - good father - good friend - good mate
If your spouse feels that you don't quite measure up as a mate, there is a good chance you've fallen short as a good man, father and friend.
Or is that a wrong premise? Maybe you can be a great man, father and friend, but the romantic/sexual chemistry just dries up after a few years, and that's to be accepted as a normal course of events?
Me: 50, MLC/WW 45 Young kids Nov 2015: BD1 Apr 2016: BD2 Jan 2017: W filed Feb 2017: D final