This research examined biases in perceptions of current versus former romantic partners. Study 1 employed individuals in dating relationships ( N = 161) and examined whether perceptions of current partners’ traits differed from perceptions of former partners’ traits. We computed an index of a ‘partner discrepancy bias’ (PDB). PDB was related to relationship satisfaction. Study 2 assessed the motivational underpinnings of the PDB. We used a standard forced-compliance paradigm, using individually run participants ( N = 65), to determine if partner perceptions are rooted in dissonance processes. Dissonance effects were manifest in both post-manipulation attitudes toward partners and post-manipulation nonspecific skin conductance. Dissonance effects were pronounced for low self-monitors. Implications regarding motivated perceptions in relationships are discussed.