Jealosy in love is good or evil?

It's based in insecurity

It will sour the relationship.

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there is righteous jealousy. 

there is a spirit of jealousy. (not good)

love = trust

when you lose trust , trouble will come.

with love comes a little jealousy at times.

be careful of the unrighteous jealousy.

 - trouble will come of it!!!!!

Num 5:29 ¶ This is the law of jealousies, when a wife goeth aside to another instead of her husband, and is defiled;  (keep reading)

The bible speaks a great deal of Jealousy.  In some contexts it's a positive quality and in others negative.  Consider Exodus 34:14 "For thou shalt worship no other god: for Jehovah, whose name is Jealous, is a jealous God:"  This contrasts with a different type of Jealousy as noted at 2 Corinthians 12:20 which clearly indicates it's not suitable "For I am afraid that somehow when I arrive, I may not find you as I wish and I may not be as you wish, but instead, there may be strife, jealousy, outbursts of anger, dissension, backbiting, whispering, being puffed up with pride, and disorder."  A great article here https://tinyurl.com/jtz3ru74