DEAR HARRIETTE: I have been in a relationship for 26 years, but I am still not married. I have built a life, a home and a family with this man, but we have not taken the next step. I am waiting for him to show me that he appreciates me by marrying me. It just isn’t happening. I am tired of waiting. Is it worth staying, or should I finally move on? -- The Next Step DEAR THE NEXT STEP: You have stay…