I'm not the author or in anyway associated with them, but I thought I would offer a suggestion. If you are in chapter 4 and get "You are not close enough with X to select this option" for all the love interests, then you are going to get the bad end (in my experience). What I did was start again and focus on one romance path, choosing every single romantic/flirting option for that love interest. If you don't get close to at least one of the characters fairly quickly, then you aren't going to be able to avoid the bad end. I hope that helps!
This is good advice! Also @firelily162 and everyone else struggling with the bad end, you can find a link to a walkthrough I made in the game description above as well, it's at the bottom! It lists all the necessary choices and conditions to get a specific route at the end of Chapter 4 and avoid the bad end.