Just seems like a weird thing to put in for the poster girl of the game when a lot of people are probably going to be interested in her.
Imo you are jumping to conclusions here too.
You don't know what happened with her boyfriend. After all she was conflicted about canceling with her brother, she didn't really want to visit her boyfriend and afterwards she said she shouldn't have done it. The dialogue is probably intentionally left ambiguous about this. Usually a woman wouldn't be like "With what happened I shouldn't have met him", after spending the night and having sex with her boyfriend. So I'd assume something different must've happened.
On that note I do think the ending of the episode is the weakest part. Canceling on your brother to see your boyfriend whom you haven't seen in a couple of months is ok, but I don't know anybody who would just stop doing what they are doing and start getting ready for their date, without giving the brother a headsup first, that seemed very unrealistic behaviour just to create a conflict between the two of them. Are ppl. here really saying they think its ok to cancel plans with somebody without telling them and maybe even asking them whether its ok?
Then the mc get's worried about his sister for not coming home, even though there is a perfectly good reason for it. And she also isn't the most responsible person, so not showing up for work in time, kinda fits.
We're probably in for some heroic rescue mission at the start of ep2, can't wait