Starcrossed.

Summary: Kat and Ben are both carrying on affairs with married spouses that are going nowhere until one night when a chance encounter crosses their paths. Ben saves Kat from being hit by a speeding car, and once they look into each other's eyes - it's magic. Suddenly both of them want out of their relationships to explore this forbidden love, but everything turns on its head when they find out that Ben is sleeping with the wife of Kat's lover! Now both find themselves being drawn into a dangerous yet erotic entanglement that will lead to jealousy, excitement and quite possibly - death.