I don't want my boyfriend around my friends
Why don't you want him around your friends?
He steals my friends attention away from me.
It's not very nice to exclude your boyfriend from your social life completely. It's usually expected to bring your bf around friends.
I'm going to just not tell him whenever I go out with my friends.
You will have to learn how to incorporate your bf in with your friends because keep him away will only lead to suspicion and resentment for not being included. Your bf can be there to support you with your friends if only you will include yourself in when you are all together.