Bad Influence (1990)

Michael, a junior executive teetering on the edge of social disaster, finds himself cornered in a bar, facing the wrath of a possessive boyfriend. Salvation arrives in the form of a striking, enigmatic stranger who intervenes before vanishing as quickly as he appeared. Fate, however, has other plans. Later, a chance encounter on a moonlit pier reunites Michael with this captivating figure. Slowly, insidiously, the stranger weaves his way into Michael's existence, promising excitement, but threatening to unravel everything he holds dear. Prepare for a descent into obsession, where reality blurs and nothing is as it seems.