You're right, LIs know more than I thought.Lis are clearly pretending not to know, so I wouldn't worry, they would have all the elements to ask MC for an explanation by now.
Jill knows that MC had an affair with Josy and Maya, she knows it and she never asks him how it developed, but if she is surprised in the seventh chapter.
in the same way Sage knows it too (if you are her fuckbuddy) and she will never ask you anything either
in the same way Josy knows about the date with Jill and took 3 chapters to ask how things were going
Bella knows about Jill, and if you went to see her in chapter 4 she also knows about Josy and Maya (as well as seeing you repeatedly with them in the library). and she probably has suspicions about Sage
the only one in the shadows is Bella, who only Jill has any suspicion of.
Sage and M + J, they all know that there is (or has been) something between them and the MC.
Josy and Jill too.
Bella knows about Jill, but not the other way around.
So yes there shouldn't be too much drama around it. Unless we start to have, in future episodes, direct possibilities to choose a girl, or to end a relationship. There, it will be necessary to choose and not to tempt the devil.