hello hun
i know how you feel. don't ever let an unfaithful girl lead you to destroy your life or get you into drugs.
your young you have your life a head of you and guess what she wont be the first and last one you will meet a lot like her .so what you going to do punish your self every time a girl leave you or cheat on you. no sweetie. your going to forget her. and your going to take a lesson from such an experience. she doesn't deserve you. you deserve some one special as you are.
ill tell you a story it is such a great story and a real one too
my trainer he was a therapist and he had a patient once who tried to kill him self because his wife keep cheating on him. so the guy story is that he loves his wife a lot once he saw her with some one he got upset and she apologize then he saw her dating some one he fight with her and then they got back to each other last time he saw her in his bed with some one so you know what he did he throw him self from the 2nd flour but he didn't die he broke some rips and his leg he spend weeks in the hospital. the therapist ask him why did you do that throw ur self he answered i wanted to make her feel guilty that because of her unfaithfulness she killed me. then he asked him so did ur plan succeed does she feel guilty he said no she didn't even visit me at the hospital. the therapist tried so hard to open the guys eyes that his wife doesn't suit him but the guy cannot see it because he was attached to her in a crazy way so the therapist worked so hard to know what is the bond and why is the husband so in love with his wife he asked him many questions then he discovered that the reason is that she was incredible in bed. so he tried to convince him of getting a divorce and get married to another wife but the husband refused he didn't want to hurt her. but he promised him that if he had another wife his wife will come running to him begging him to take her back and thats what he want . so he did it he divorced her she really wanted the divorce too. and then he got married to another wife after few week he came to the therapist and he was ok and happy and he his x wife was begin him to take her back he was shocked will he was happy because he was satisfied sexually with his new wife and he had a new love and he felt there is no longer any connection with his x and finally he manage to see her real image unfaithful wife
my point is discover why ur so attached and try to find some thing or some one to fulfill your need.
or try to forget her i remember once when i was very depressed crying all the time a special one told me forget your misery and when ever a bad thoughts come up try to think of any thing else like your cloth ur school any thing with training you will get over it and i did what she told me every singl time i remember what happen to my and my eyes start to tear i say stop ok what am i going to wear tomorrow ooooo what kinda movie i wana see or let me talk to my brother about any thing and with time i manage to overcome my problem and got over it its hard but with practice you will be over it without knowing