How do i avoid him because he is really annoying and he follows me every where i go even when i have friends over
If "he" is a random person, restraining order. If "he" is a friend, try talking to him and if that doesn't work, end the friendship and go to option number 1 (same as stranger)
Who is he? Friend, brother?
It depends on who you are trying to avoid. If its your boyfriend, your father, a friend.
Tell him or someone else?