Like Water and Water by Sarah Ettritch

University roommates Rachel and Barb met in their high school’s zodiac club, where they spent hours doing their Scorpio charts and became best friends. Now Rachel has fallen in love with Barb, but Barb is dating the sultry Carla. When Barb and Carla experience problems, Rachel is uncomfortable with being Barb’s confidante, especially since Barb’s relationship issues involve sex. Finding it more and more difficult to hide her feelings and remain impartial, Rachel reaches her breaking point and makes an agonizing decision.