Why the fuck is liking your own girlfriend considered "endlessly creepy"? I can only imagine this is official translation screwing things up. It makes no sense.
My guess is finally in the shrine visit she will see the childhood friend either with a new guy or back with the old BF and finally realise she screwed up. I’m not convinced it will be enough to save the ship though. Maybe she just needs to learn that lesson about what a relationship should be.