Maybe Not (Maybe #1.5) by Colleen Hoover

Colleen Hoover, the international bestselling author of Maybe Someday, brilliantly brings to life the story of the wonderfully hilarious and charismatic Warren in this exciting novella.

WHEN WARREN IS offered the opportunity to live with a female roommate, he instantly agrees. It could be an exciting change. 
Or maybe not.

Especially when that roommate is the cold and seemingly calculated Bridgette. Tensions run high and tempers flare as the two can hardly stand to be in the same room together. But Warren has a theory about Bridgette: anyone who can hate with that much passion should also have the capacity to love with that much passion. And he wants to be the one to test this theory.

Will Bridgette find it in herself to warm her heart to Warren and finally learn to love?
Maybe.
Maybe not.