I'm this prude shy girl.. why am I falling for this really experienced emo guy?

So I've only seriously like about 5 guys in my lifetime.. and acted on and of those guys and when he moved I went into a spiraling downward depression but he told me to move on so I've been trying for the past 6 months to no avail but this emo guy in my gym class keeps jokingly hitting me and pushing me over and having "fights" with me and he always comes up to me. On the last day of school we had all this extra time after the exam so he came up from behind me and we talked for an hour and I'm really starting to like him even though I know hes a manwhore and he smokes and does drugs.. is it because I'm bored with life and want something interesting? Should I act on this? I got his number through a mutual friend and he said I turned him on so much with the mini skirt I was wearing and he said he wants to do me and I love the attention.