There is no "third-act breakup" or major external antagonist. The conflict is internal as the characters navigate their evolving feelings.
Alex is portrayed as neurodivergent (specifically autistic), finding most people difficult and relying on strict routines. Reviewers from Goodreads and Book Recs and Blooms highlight how Sebastian treats this representation with care and nuance. Daniel Cabot Puts Down Roots by Cat Sebastian
The novel is widely praised for its gentle nature and lack of typical high-drama tropes: There is no "third-act breakup" or major external antagonist