I Don't Want to Be in a Relationship Anymore

I was in a relationship and living together with a man and it all seemed fine. We had little to no sex and barely any intimacy, because we didn't know how to talk about him. My libido dropped to nothing and I found myself increasingly getting annoyed at the little mannerisms I had always found charming. The long and the short of it was he loved me with his whole heart and I loved him with only my fingertip. How do you look back on having handled a relationship in such a mediocre way? Sam and Sierra, I don't know if I'm looking for concrete answers or just a handful of your often well-structured nuanced thoughts.