You can start specific episodes with different relationships statuses:
So when the last episode is released, you'll be able to switch them on and off as you see fit to see different endings.
What would be handy, however, is when the last episode is released if there was some sort of simple break-down of how each variation plays out in simple terms, i.e. you could have something like:
- Katie ending (love)
- Jenna
- Romancing = hates you
- Romancing (no love) = remained friends
- Neutral = friends
- Broke Up = friends, but slight resentment
- Monica
- Jenna ending (love)
You get the jist. Something like that that lays out all the endings with all the other possible relationship statuses and what their relationship with the MC is like in each ending. It would save a bit of time for the players having to keep track of and figure out all the possible combinations, especially since the devs would surely know them and it could be easier for them to write up something like this.