Drift (2000)

Storyline:

At his agent's party, Ryan, a young screenwriter, and Joel, Ryan's boyfriend, meet Leo, an aspiring novelist and a college student. During an intense conversation about serial killers, Ryan feels viscerally connected to Leo as if everyone in the party has vanished. Out on a limb, Ryan leaves Joel's apartment on the fateful morning and drifts into three different possibilities of a love triangle.