Most people would feel jealous upon seeing someone else get better results than them despite not working as hard, so someone who claims not to be jealous is actually being ironic.
Consider the statement "I was jealous when my co worker kept getting top spot when I knew he was cheating.". Based on this "I wasn't jealous at all when my co-worker kept getting top spot even though I knew he was cheating." a true statement? Yes, no, or I don't know?