I've found myself getting secretly but strongly jealous over tiny things. how do I overcome this jealousy?

I've found myself getting very jealous about small things, like small interactions my girlfriend has with other boys, and the fact that she reads smut (this drove me crazy but I never said anything to anyone). How do I overcome this jealousy? It's irrational and it really annoys me.

I've found myself getting secretly but strongly jealous over tiny things. how do I overcome this jealousy?
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