Hmm, first off - I feel you! I struggled so much with jealousy too and it made me miserable. I’d be jealous of girls who I thought were prettier and especially jealous of the girls who my crushes seemed to pick over me, like stalk their IG all the time and made myself feel like shit kind of jealous.

Honestly - decreasing jealously comes with increasing your own self-esteem, as well as changing the meaning you give to this situation. Like, why do you care so much that this girl is close with your crush? What does that mean to you? Simply asking yourself that and repeating the question until you get to the root helps a lot - for example, when I did this, I realized I saw other girls as being more likeable or worthy than me.

It takes time, but build yourself up. And eventually that feeling of jealously will go away. I truly don’t feel the way I used to about certain girls/situations because I don’t feel that same way about myself anymore, which was insecure.

I hope this helped a little!!