Will I always be jealous or insecure?

Well you need to learn how to trust him. I'm sure you have a few guy friends, well its pretty usual that a guy would have some girls as friends as well. I understand you, i'm a VERY jealous person and very insecure, but how i overcome it is having confidence in myself. Look, theres always going to be someone prettier, smarter, and maybe having a better body shape then you do. But you got to remember WHY he likes you. Every sinlge person on this earth is unique, its YOUR uniqueness that he likes. He picked you over other girls because to him your unique. For example: theres alot of cute, smart guys but i love my bf because hes HIM. no better no worse. Just need to realize that and you will be fine.