Is jealousy always a bad thing if your with a partner?

I’m not a jealous person, I could invest a lot in somebody else and still be happy for them if they are in a happy relationship with someone else. I had one guy say I’m treacherous and disloyal cause I said I don’t get jealous when I like a guy. And I said a guy’s happiness is more important to me than the guys relationship to me. Later the rude guy who slandered me lied and said I slept with him to prevent other guys from being in a relationship with me.

Is jealousy always a bad thing if your with a partner?
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