Growing up, apart from his mother, he only had his childhood sweetheart in his heart, and he always doted on her. The other women are all just foils. Nonchalantness was his attitude towards other women.
But she was just traveling in his memory...
(I will write this little copy for the time being, and I will say it secretly. This is something I just squeezed out after thinking about it for a long time. I will write it again when I have inspiration. Sure enough, physics and mathematics questions are much easier to write.)