Am I wrong to expect my partner to confront a friend who encourages cheating?

My partner was told by his friend that he wouldn't tell me if he cheated with someone that was already showing interest towards my partner. We're long distance, my partner merely said no. Am I wrong for expecting a bit more than a no? Or him not being around someone who encourages cheating?
Am I wrong to expect my partner to confront a friend who encourages cheating?
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