I came to read the comments before reaching the end of the chapter, expecting talks about how the "work harder" mentality of the MC reflected the toxic work culture of Japan, but instead it's all about Gotou. So I finish the chapter and I'm like "What, that's it?"
Is this site populated by 12 years old? Well, probably, but still.
"Even though he said he liked me" is only enough to draw the conclusion I've read in these comments if you are already biaised.
Imagine, I know it's hard since this bias is obviously from the lack of any meaningfull relationship experience, or empathy, but still, imagine someone confesses to you, saying they loved you for years, and you reject them, for any reason, that doesn't matter.
Then, the next day, they're already with someone else. Now it's not about being interested in them. It's about them lying to you when they said they loved you. They waited years to confess, but switch to someone else immediatly? Looks like they tried to bullshit you to get into your pants, and went after someone else when it failed.
Anyway, that's just a throwaway line that the probably MALE author wrote to hint at future developments, without any psychological or behavioural meaning. They want to write a harem story, so they write whatever get them there.
Using this to make generalisations on women is like using Family Guy to prove dogs can talk.