HA! Season 6: Feeling Replaced

Since San Lorenzo, Phoebe is fully engaged in her relationship with Gerald, even going so far as to ignore Helga. But when Helga starts to befriend Rodrigo for ulterior reasons, Phoebe begins to suspect Helga is replacing her in revenge and is burdened with jealousy. Is Helga really replace Phoebe and what can she do to ensure she remains Helga's best friend?