The Thomson family didn't like the Martin family much, and Robert Thomson had no feelings for Ella Martin. However, Robert's mother was Ella's aunt, and she naturally hoped that if her son were to marry, it would be with someone from her own family. It would be familiar and a good match, how nice!
However, although Robert had no feelings for Ella, she had liked him since childhood.
Robert was the kind of person who was a strict boss when facing subordinates. In face of someone he genuinely liked, he was the tenderest and most considerate lover. Facing friends and family, he was a pure and gentle friend. Only when facing female companions like Emma Smith, he wanted to find the feeling of another person from them. On the one hand, he knew in his heart that no matter how similar they were, they were not her.