jealousy

i need help... i really don’t know what’s wrong with me. i know it’s wrong to hate my boyfriends brothers girlfriend... like idk i just feel jealous bc she’s pretty, she has a great personality (she’s really confident & outgoing) , she’s always hanging out with my boyfriend and his brother, she’s always going over to my boyfriends house to see his brother... how do i stop feeling that way? i think i’m jealous because i feel like i’m none of those thing and i really wish i could see my bf everyday but i can’t. )): i need to know if there’s any way to make me stop those feelings, i know it’s bad but i really don’t know how to stop it.. she’s a really cool person, me and her have talked and we get along in the moment but those feelings change after a while and i start being jealous again. i really don’t know what to do..