Have you ever postponed a wedding because things at the time felt kind of…I don’t know, maybe sour?

We’ve been together for over 6 years and engaged for 3. We live together. I love my partner, and I would do anything within reason for him, and I don’t want to not be with him ever. I know everyone goes through tough times in relationships, but I’m scared that a sour patch isn’t a good sign before marriage. There are no trust issues or infidelity issues, but things just don’t feel like they used to..I just need some words of encouragement, and maybe some advice. I still want to marry this man, but I want to go into our marriage happy and in love, and I’m not feeling that way right now. 😕