My wife and I have been married for over 20 years. Our sex life has never been great - recently though she told me that she’s never enjoyed it and no longer wants to make love together, and that she would understand if I went elsewhere....this has me at a total loss. I love her dearly and the thought of turning to someone else terrifies me and racks me with guilt - I’m not obsessed with sex, yet I have my needs too. Beyond the bedroom, the marriage is great....What should I do?