Nav's Foolproof Guide to Falling In Love, by Jessica Lewis

Nav and Hallie are best friends.  And while Nav is a lesbian and Hallie is bisexual, friends are all that they have ever been.  It's probably just as well because Nav is ARO and Hallie is a hopeless romantic.  But while Nav doesn't want a girlfriend, she can't imagine being apart from Hallie.  When she finds out that Hallie is going to be away this summer attending an academic program, Nav is obsessed with figuring out a way to join her despite her own lack of academic prowess.  

The solution to the problem turns out to be complicated.  Nav finds out that a bright but socially awkward girl named Gia is obsessed with dating Hallie.  Gia will do anything for Nav's help with Hallie. And so a trade is engineered:  Gia (who is attending the same summer program as Hallie) will give Nav her place in the program in exchange for help getting a date with Hallie.  But before that date can happen, Gia needs lots of help.  Nav may not believe in love, but she knows a few things about Hallie.  Through some training and "romance practice" Nav will teach Gia how to woo Hallie.  Everyone wins!

But of course it doesn't work out that way.  The more work that Nav does with Gia, the more they start falling in love with each other.  And in the end, Nav has to admit that she is not as ARO as she thought.  Along the way, all three girls deal with the changes in their lives and personalities, coming to acknowledge that change can be good after all.

The story was fine, but I really disliked the main protagonist.  Nav's irresponsible with absolutely no accountability (as well as no sense of how to charge her phone!).  She treats both her father and Hallie abominably.  She drinks to excess, uses her sexual partners, and skips out on work.  She's judgmental of others while constantly running away from her own faults.  Frankly, Hallie and Gia both deserve better and they probably have some work to do on their own senses of self-esteem.