roommate and boy trouble

how do i tell my roommate that the guy i wanted to date ended up being a scrub and now an old friend wants to date? thats not the end tho, i kinda locked her out of the room when me an him were in there an now im locked out of the room and im sick of telling her my business. if i wanted to tell her how i met every person in my life i would but seeing how i like my privacy i dont want to talk to her about it!