That's weird. I get all three going at once and even the self-absorbed and attention seeking Jean starts up with wanting to date the MC even though she knows he is dating Anna Marie and Anna wanting to date even though she knows something is about to start up with Laura. They all know about each other before I tell them and they don't seem to mind. I get each of them presents and nobody complains about what the other got so far. Did you start a relationship with one and say you wanted to just date them without leaving the option open?
So what had happened was: My plan was to stay monogamous with Rogue for 0.3 since I was a slut in 0.2b. (...despite never getting my guitar in 0.2b despite buying the girls everything, and yes, I'm still going to be bitter about that for the time being, but I digress.) But apparently trying to take a monogamous route while buying Jean pants counts as flirting in the game, which differs from how I interpret buying things for lady friends in real life, where I just saw buying Jean pants as a platonic thing, as opposed to something more intimate like panties or a sex toy. Like, being called out and questioned about it on it was cool, but not being able to say something to the effect of "No! It's not like that! We're just friends!" was disappointing.
So, I think the writing team and I have a different understanding of what constitutes as flirting in regards to gift-giving. So I guess my bit of feedback is to consider having some flexibility with keeping things platonic with the girls that you don't want romantically and/or sexually, like having a "hang out" option and differentiating between which gifts can be given with platonic intentions. And not just for the sake of my self-insertion role-playing point of view. If this game ends up getting close to the nine or ten girls that RLE is offering, having all of them try to jump your bones can get exhausting at times. Oni and Prime have a video gamey-ass way to avoid that potential issue, thus the term "Prime them out of the game". But since every character so far plays a part of Null's development, maybe just having some of them as friends while still acknowledging their existence can have a pragmatic/future use as well?