Dammit ok so from Undergrad Steve's Patreon:
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Edit: 15.0.3 is now live!
The game had a bug where relationships reseted when loading a save. This caused unfitting dialogue and rejections from girls you were dating for example. This bug is now fixed, however all saves you loaded in v15 may be affected. The best way to fix this for v15.0.3 is to load the original save from before v15 (if you didn’t overwrite it), a different save that you haven’t loaded since playing the update or to start a new playthrough. We’re bringing advanced options to the path builder in 15.1.0 hopefully in the following week to make restarting even easier and more flexible. Furthermore we’re working on ways to restore relationships that have been reset by this bug, by checking for other choices that cause the relationship to change, this will however not be implemented until 15.1.0.