Both relationships are unequal in relation to their peers, being unhealthy for all involved.
Desdemona is passionate and dedicated to Othello, but his insecurity and lack of trust cause the relationship to become unstable, leading to a tragic and unhealthy end.
Bianca is also in love with Cassio, but Cassio is more dedicated to his professional career and does not value Bianca for being a courtesan. This establishes an unequal relationship, which causes Bianca to suffer and does not present a healthy relationship.
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