You need to focus on Jaye, and when the option to have a relationship with Mallory comes up sleep with her but tell her it's just to help her, no relationship. If you run a relationship with her it appears Jaye finds her too threatening. This is the chief complaint that seems to show up, as the expectation was that if dating both were going to be an option for the endgame, the open relationship would be the way to do that. You'll need to keep relationship points for both pretty close to as high as you can, and then make some correct decisions. In particular, when talking to Jaye in the latest chapter about her med school woes, choose the "phone a friend" option (which unfortunately just seems like the better choice without that being well telegraphed).
If you're confused hearing about an epilogue, that's probably people talking about the last chapter, which isn't out yet. The game is marked completed but as the dev updates have made clear, there's an epilogue coming and then a technical rework of earlier chapters before they're done with the project.