School stuff?

im going to high school this yearand i want to leave behind a ex girlfriend because shes ummmm well a slut shes not a virgin any more and shes been with 3 guys in one week she does pot, and she gets drunk SHES 14 YEARS OLD. she broke my heart when she was better nicer and not emo well i cant realy say anything bad about that i have that problem to but im over it and never going to do it again. she ment alot to me and it kind of like i want her to be safe cause i kind of still care about her but im not attached over her ive dated since her but its like i just want to forget her and move one to other girls.( ive tryied helping her so plz dont talk to me about that)