The Very Thought of You (1998)

"Two's Company. Three's a Crowd. Four's a Disaster."

Laurence recounts to his neighbour how his life long friendship with Frank and Daniel has been overturned in just three days by their each independently meeting, and falling for, Martha, who has no idea of their connection. Slowly the tale unfolds, the narrative moving backwards and forwards gradually filling in the gaps until we see the whole picture