The One That Ran Away by Hildred Billings

Their love was written in the stars, but one of them wasn’t yet ready for fate.

Ten years ago, Jess Mills had her life changed when she crossed paths with Shannon Parker, the most beautiful girl at their small liberal arts college. But what Jess assumed to be nothing more than a crush on a straight girl turned into the night of her dreams senior year.
Then? Nothing. Shannon was gone before graduation.
One of them has moved on. The other is just getting started.

Shannon bumps into Jess shortly after moving to Portland, a place her ex-boyfriend decided to call home. Both single, and both reeling from post-college life, Shannon realizes that it’s no mere coincidence she’s once again encountered the girl who defined her co-ed years.
It’s fate.

Jess’s love for astrology and divination is about to come in handy now that Shannon is determined to face her feelings and understand the whim of the universe.
She isn’t running anymore.