Thank you for your response heartandwhole, ı had never talked bad behind her back to my family nor friends because i would forgive her for what she does but my family wouldn't so my family would love her until i had to tell them what happened (her leaving me for a drug dealer). They tried to cheer me up, my aunt even took me to a Holliday in a 5 star hotel. But my wound was fresh back then i didn't enjoy it but i appreciated their effort. Same thing goes with my friends. They know both the girl and the guy. They cheer me up by calling stupid nicknames to the other guy (like cockroach). But time did the most of the healing precess. I am feeling much better now compared to 2 months earlier when i can't sleep without nightmares. I still think of it occasionally. Ok not gonna lie i think of it all the time when i am not occupied. So i started to swim in order to shake those twisted thoughts away and to shape my body (she always complained about my body i was a bit thin) but i gained weight now and when i see my self in mirror my confidence boosts cuz I look good compared to a few months earlier. Most scary part is we are at the same college and we will have to see each other there. I don't have any feeling for the girl but then again i don't want to see them together. Yet i am not sure if they will be seen as together in school for they were hiding it because everyone knew our relationship. I think they afraid of the gossips.
As for the BPD, she had told me she had diagnosed with a personality disorder but never told the details and i didn't took it seriously. She had told me that her mother tried to chock her to death with a pillow when she was a child. Perhaps that's why she is like this.
Although i don't want to be with her again (my family and friends wouldn't forgive me I would lose my dignity for accepting her back and they would be right) i still care for her. I still don't talk dirty behind her like saying she was a whore anyways. She was worse than that actually: a dementor, a succubus, a black widow... .
To sum up with, i am feeling fine mostly. But I think I would feel more relieved when she talk to me again and if she says that maybe we can try it again i say f off. Then i would rest in peace

. Thank you again. (sorry for my bad English)