How do you reassure a guy?

ok i know my boyfriend has some anger issues and i know he is insecure. in my last question i put up i asked if he was leaving me. well they said i need to find someone that acts like an adult. well i found out that he is just really insecure. i dont understand what i need to do? i dont like his friends at all. but i dont want to be rude and tell them to go the hell away and stuff like that. so i just thought i should act mature and just go with the flow. so last night my bf had his friend levi come over and of course they were acting retarted as usual. well i ended up talking about my good friend victoria. he said he knew her from another school and he said she wore this cotton candy perfume and it smelt so good he wanted to eat it i said all my friends like my perfume to and he asked me what kind it was and we literally started talking about perfumes. well then my bf started to get mad that me and his friend levi were just randomly talking. my bf was also talking about it to.i just wanted to join the conversation that they were having. i was just sitting there being bored listening to them. well anyways hes really upset about that and i swear on his neises grave that i dont like his friends period. how do i make him feel happy? how do i let him know that i want him that i need him. he also gets mad that i cant tell him y i love him. i honestly dont know y i love him. i only know that i have a feeling in my heart that i need him and hes the one for me.