He's always on my mind...?

i really like him and he's always on my mind. we're good friends though and i dont think he likes me like that. is it worth it to tell him my feelings? i just dont want to ruin our friendship. hes cute and hilarious and sooo sweet. he thinks im into the bad boy type because my last relationship was with a druggie (im not anything like my ex. im a complete opposite and we broke up because he was a bad influence on me). i really like him but i dont want to risk it. what do i do?