AL had 22 different endings; 9 variations for Megan, 9 variations for Melissa, and 4 variations for Rena. This game has 5 main LIs and many more side girls than AL had, so the number of variations could be well over 100 when you consider that and the fact that this has so many more choices as well as the Affinity/Status system.
We'll likely see endings for Bella, Sage, Jill, Maya, Josy, and M&J, and there will undoubtedly multiple variations for each dpending on your relationships with the other LIs, you relationships with the side girls, your RP with the LI, you Affinity and Status, and what choices you made and events you triggered. In each of them, there will probably also be the bad/rejected endings where you end up a side girl, likely Quinn, but there could be other side girls if you didn't do certain things but did do things for another girl.
It's honestly mind-boggling to imagine just how many ending variants this game could have, even if it's just small moment of variance like it was in AL.