From the subreddit I linked in another comment, there did seem to be some "magic" that 4o had for these kinds of "relationships". I'm not sure how much of it is placebo, but there does seem to be a strong preference in that user group.
That's one way of interpreting things...
That's an actively harsh response, pushing these people away from the idea GPT is in a relationship with them. So even if the initial tune was meant to increase the attach and retention rate their actions show they don't like the way it turned out to influence people who were using it as a friend/lover bot.
That's apparently a feature to a significant amount of people..