Is it true that once jealous someone generally stays that way?

sacredtigerlily
Brief intimate history with long term friend for about 6 months. While he never had the appearance of being the jealous type with others, he’d act that way when someone was nice to me, even though he claimed to be about casual only. This happened after he moved away, where he’d act weird when someone was nice but when called on it, would act ambivalent. Just wondering if someone, once they act like that, generally stay the same (so jealous), or can they evolve/change? Anything is possible but heard from a family member the old adage of “once jealous, always jealous”, so just curious if that’s true.
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Is it true that once jealous someone generally stays that way?
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