Hi Steve68,
I fully agree with OronD, Betty Poole and Romeo about their inputs. I gave them two thumbs up. Do you remember upsetting her about something? Are you still loving, caring and romantic towards her? Are you attentive to her needs, compliments her with what she does at home for you and the family and also appreciates her sensuality? Are you maintaining your nice body build and not neglecting your physical appearance? not gaining too much weight especially around the stomach area? Do you have hobbies that you both enjoy together? Have you had vacation lately just the two of you? A one week cruise would be perfect, there are lots of fun things in a cruise.
Try to do more soul-searching and see if some of these will help. I certainly hope you will be able to save this marriage. There are always ups and downs in life and marriages. This is just one of the downs. You are going to overcome this.
Well, you take care and keep us posted.
Rina