At its core, "Fatal Attraction" is a film about obsession. Alex Forrest's character embodies the concept of fixation, as she becomes increasingly unhinged after being rejected by Dan. Her actions escalate from seemingly innocent and flirtatious to stalker-like behavior, illustrating the blurred lines between love, obsession, and madness. This portrayal raises questions about the nature of obsession and whether it can be considered a legitimate expression of love or a manifestation of a deeper psychological issue.