In the past couple of days, he could tell that Celia's feelings for him were definitely more than just sibling affection. He wanted to know, how exactly did he and Celia get along in the past?
Moreover, he vaguely realized that his own feelings for Celia were probably not limited to just brotherly love either. So, in order to recover his memory sooner and recall everything, he had to start from the only fragment of memory that remained in his mind.
Perhaps Ellie Wilton could stimulate his memory nerves, and then he would remember everything.
He had also looked up online how a person with amnesia could recover their memory quickly. The method was to find more stimuli to stimulate oneself; maybe then, he would recover. Of course, the blood clot in his brain also needed to be removed.