The games Loyalty/Corruption system kinda sucks. It would make more sense if this wasn't a sandbox and more of a linear "choices matter" kind of story. It seems you can't reliably increase either your Loyalty or Corruption, and since you need a certain amount of either to progress your relationship with any of the girls, it becomes a confusing mess trying to figure out what interactions you still have available to increase one or the other.

This is incorrect. Currently, you can increase your corruption reliably through club events in game. (You cannot increase your loyalty though you will be able to in future updates through church)

But I understand your problem, since in some cases it doesn't tell you what does what. That still needs improvement through tutorial and a walkthrough.

I do agree that it's hard to know what to do... the game starts telling you to finish therapy on saturday evening but for some reason it took weeks before that even activated for me... and even then I can't find a list showing all the quests... I only just see one. And sometimes when you get stuck you really become clueless what to try next... also annoying you can't repeat the Eugene quest xD