how do i keep myself from falling

i have fallen for him once... i don't want that to happen again... i think i have gotten over him... i don't know.. i'm not sure.. i think i have... but with him hanging around... oohh!! it hurts me so much that he doesn't ever really notice me... i'm confused.. i think he's doin' this on purpose.. but sometimes i also think he's just far too insensitive to even think of how i feel...