Even though the game allows you to do that I really feel it was never intended to be played with just a solo route. Imagine you're on a solo Debbie path...
So I decided that while Katie (and Jenna with her maybe) is my endgame I do keep other paths open so playing the game makes more sense and is a bit more fun. In my headcanon the MC is entirely faithful to Katie though, with some Jenna on the side
The two are so cute together. But meanwhile also enaging with Jolina, Elaine, Bella, Wanda just makes for an overall better experience, especially since Dizzy is most certainly connected with Jo/Bella/Elaine. I had to ditch Monica though, things had gotten too crazy with three love interests in one house. My poor nerves!