jealousy

so umm i was hoping for advice?
i'm a very jealous person i think? so whenever my bf talks about a girl a feel really sad? a lump forms in my throat? is that jealousy? even though he just talks about a friend. like, for example, xxx said that...., stuff like that. i never tell him not to talk about other girls. so is there anyway i can stop thinking like this? i hate that i'm like this. so any tips or advice? i dont wanna be a toxic person. Thanks!