If you make decisions which permanently reject certain girls and only leave 1-2 romantic love interests, the game would soon become boring. The game needs a wide variety of girls and events to entertain for the length of an episode. Even when you not follow DIK or CHICK route, there are currently events with Josy, Maya, Quinn, Sage and Bella for all players.
It would be strange if Josy and Maya events in next episode were completely removed for players who did not choose J&M threesome since it would also reduce variety for those players which only could be compensated by adding scenes with new girls or some sidegirls. Heading for a monogamous relationship with only one LI (e.g. Jill) might result in a rather short and dull playthrough.