Love Study by Nicole Pyland

Larissa Hanson is about to get her doctorate in psychology when she gets an idea to write a book about the science of love. Helping her will be her best friend forever, Harlow Madden, who gives Larissa the idea to interview people and ask them how they fell in love.
The only problem is that Harlow has been secretly in love with Larissa since they met over a decade ago, and listening to other people tell them their love stories makes her think that it might be now or never with her best friend.
After leaving her previous girlfriend, Harlow is once again staying in Larissa’s guest bedroom, and that, combined with these interviews, has her looking for a change in her living situation as quickly as possible because playing house with the woman she loves is too hard when she doesn’t believe that Larissa will ever return her feelings.
Spending time in these interviews makes Larissa think about her own lack of a love life and wonder more and more about Harlow, just as Harlow is contemplating pulling away.
Will either of them have the courage to tell the other how they feel before Harlow moves out or moves on?