Puccini for Beginners (2006)

Allegra, an opera-loving writer in New York, eschews commitment, so her girlfriend, Samantha, leaves her. Allegra misses Sam, and resents the accusation that she's afraid to say "I love you," but she's soon involved with two people - Grace and Philip - who, unbeknownst to her, have just broken up with each other. Allegra juggles the two affairs, telling neither about the other; each likes her more and more as her old fears start making her itchy. Things come to a head at an engagement party where Allegra is pinch-hitting as a catering assistant.