Forgetting Sarah Marshall (2008)

Peter Bretter, a struggling musician, faces utter devastation when his girlfriend, actress Sarah Marshall, abruptly leaves him for the magnetic rock icon Aldous Snow. Seeking solace, his confidant Brian proposes an escape: a Hawaiian vacation to mend his broken heart. However, paradise takes an unexpected turn upon Peter's arrival. Amidst the serene beaches and his burgeoning connection with the captivating hotel receptionist, Rachel Jansen, Peter confronts his worst nightmare. Both Aldous and Sarah are also vacationing on the island, setting the stage for an inescapable collision of past and present.