I had always fancied that his manner to Cynthia was rather constrained, and that she on her side was inclined to be shy of him. 
I liked that Cynthia could be shy. 
mnli hypothesis: I liked that Cynthia could be shy.  premise: I had always fancied that his manner to Cynthia was rather constrained, and that she on her side was inclined to be shy of him. 