boy problems

okay so my best best friend in the whole entire world is a guy and he lives back in my home town which is a couple hundred miles away, so i never see him much but we talk all the time. my issue is that i do have a boyfriend and he does know that he is my best friend and that it’s nothing more than that and he’s okay with it because he knew my best friend and i have been friends wya long before he came into the picture. i don’t like him but i get jealous when girls take his phone and text me from it or when he talks about girls liking him but i guess it’s because i feel like i’m going to get replaced but at the same time i have a guy so why should i care?