Ghosting, love bombing, and breadcrumbing are all inconsistent or manipulative relationship behaviors, but they are different in how they are expressed and felt. Ghosting is when a person suddenly shuts down all communication with no explanation, like a total withdrawal.
Love bombing is overshowering someone with attention, affection, and promises in the beginning of the relationship, which slowly subsides once the other person is attached.
Breadcrumbing lies somewhere in between - where the individual does not completely vanish, nor do they completely invest. They instead provide small, inconsistent acts of attention to keep you interested, without ever making any real investment in the relationship.
Though the approaches are different, all three can have a big emotional effect - if your needs for clarity, connection, and consistency are not met